adoptable advice?

Honestly, adoptables are a very overflooded market, more and more come out everyday. And people tend to make them in large batches.

Honestly, maybe a good piece of advice I can give you (and I dont know what will help but this what I have noticed as a buyer.) People are more interested in adoptables if they have detailed refs (front view, back view, headshot etc.)

If they are off base (I.E they dont use "bases") I dont know how often you are making adoptables but maybe try a quality over quantity approach? Make your own base maybe, attach a mood bored and make maybe 1-3 adopts that are super detailed.

Versus coloring in base with 10-15 adoptables and hope it sells. Adoptables that are more detailed tend to sell better especially if you don't already have a following. 

TBH the only time I see base adopts sell is if that artist already has a following and people are already clamoring for their designs. I'm not saying other people CAN'T sell adopts... its just I've noticed a trend between selling and already having a previously established following.

Id say 100% quality over quantity. My best advice would also be look into what adoptables are popular. What art/adoptables are popular tend to change. Just like fashion.

I've sold all my adopts with relative ease so I like to think I have some good advice to give. 

1. Don't sell adopts you wouldn't buy yourself. I don't mean this literally. I have never bought an adopt myself, but my approach to designing adopts is to create adopts I myself would actually enjoy having (that would essentially be characters with funny, eccentric personalities with a design to complement them). I really don't recommend creating adoptables based on popular design tropes unless you yourself like them. If your tastes in characters are weird and hyperspecific you should go with those designs. I guarantee you there's an audience out there with the same taste in characters as you. 
2. Have a list of adoptable artists that inspire you and learn from them. You should observe other successful artists and try to imitate what they do 'cause clearly it's working. I'm not saying you should copy their designs and practices exactly but learn why it's successful. Artists that inspire me are Stormzilla, Kitkaloid, Sugaryu, Rinotuna, Isakytm, TerraTerrific, Pigeon 666, Nolnir, and Dead Slug to name a few. I browse their designs every time I'm stuck and need inspiration. Here're my designs if you'd like to see what I'm doing.
3. Quality is better than quantity. I agree with a lot of what Polka said. Base art doesn't sell that  well unless you're already a big artist or if your designs are that freaking good. You should put a lot of effort into your designs to make sure they really stand out. It should look as good as your regular art, maybe even better. You probably want to undersell yourself in the beginning until you build an audience. Cheap adopts will make them think they're getting a killer deal by buying your designs. Then you slowly raise them to their true value. Your audience will stay with you because they've already formed that bond with you and your adopts.
4. Presentation is important. A plain white background won't get you very far. I highly recommend putting a pattern or something interesting in the background of your designs. It's relatively easy and makes your designs look more premium. Browse DeviantArt for some inspiration. 
5. Talk to your audience, don't act like a corporate businessman. If art history has taught me anything it's that the person behind the art is just as important as the art itself. I would say they're actually more important than the art in most cases! I recommend writing something fun in your description to get people attached to the character. Write about your inspiration for the design, the struggles you went through making it, or your personal headcanons for that character. A lot of artists I know even write whole stories in the description of their adoptables. It gives the adoptable so much more depth and appeal. If you have nothing to say about the design then it makes the adopt feel shallow and empty. Personally, I think the biggest turn-off about an adoptable is when the artist is too obvious about only wanting to do this for the money. If there's no passion or love put into a design then I'm not gonna want it. When someone comments on your design give them a worthwhile response. Don't give a simple "thank you", try to start a conversation. Leave an impression on them so they want to keep commenting. People love knowing that their comments make you happy!
6. Have diverse designs. I think there are enough basic, light-skinned, young, anime girls out there. That design is oversaturated and boring. If you want to sell designs I recommend having some variety in your designs. You'll have to be the best designer out there if you want to get away with designing the same thing over and over.
7. You should probably post on Deviantart. Not everyone finds success on Deviantart but that website has the biggest adoptable community than any other social media platform. That's where the majority of my audience found me along with Toyhouse. When you post on Deviantart, you should submit your design to a lot of adopt groups. 25+ groups is recommended. When your design has been sold, make sure to remove your art from the group. Every time someone favorites your art give them a llama badge. It's easy and will sometimes bring people back to favorite more of your art. Don't comment on their profile saying thank you, most people find that annoying. 
8. Don't give up! Seriously, don't give up. If it's a tough market out there and it took me a few years to find my niche. You'll make it eventually, just keep trying new things and pushing through. 

YoctoCrunch tysm! I appreciate it <3

I'll try to improve some things. Ive been trying to sell on DA recently so thanks for the advice as well!

also love you designs ^^