I commissioned Riva twice. Below is the result of my first commission.

• At first, I messaged the artist with a stickman type sketch to ask if the artist could accept my request (since I wanted a battle scene, I'd rather ask first than send a request unannounced and be rejected). The artist replied she could do it, so I applied through their commission form and waited for a confirmation/ invoice.
• I paid the invoice in full once it was confirmed.
• Riva came back with two sketches to choose from, and I was very happy with the sketch. We agreed on one sketch and moved onto the next step.
• After the lineart was finished, Riva said to me that she had miscalculated the invoice because she had missed that I requested for a dynamic pose (according to her TOS, dynamic poses is charged more due to complexity). As to such, the lineart took more time than expected and resulted in extra fees. Riva kindly explained that because it was her miss, paying the extra fee wouldn't be mandatory/ offered to make it free. In the end, we agreed that I would pay for it and the invoice should be paid when she was finished with coloring.
• After the artwork was finished and final invoice settled, I received the file through Google drive!
• During this process, I observed Riva's workflow, and in the end she asks her clients to fill out a feedback form. I wrote my observation into the form and submitted it. (This is important later on.)

And this is the second and most recent piece I've gotten from Riva! 

• As you can see the style is quite different than the previous piece. Partly because I wanted a gentle touch as it's meant to be a date, and Riva offers a wide selection of styles in her commissions. 
• Like my previous commission, Riva provided two sketches and two finishings to choose from. Also, I did not include a pose/ scenery reference in my request this time, but she managed to nail my OCs very nicely.
• The highlight for me however, was the fact the whole commission process was very smooth and Riva had listened to my feedback/ took it into serious consideration. The previous observations I wrote into the feedback form were nothing major; the whole experience had been delightful generally. If anything, I felt I was being nitpicky/ annoying to point out what I considered she could improve on (namely a few manners and service related issues, such as choice of words and having a visible worklist). But instead Riva fixed every aspect I wrote into my feedback, which in return made me feel appreciated and happy to see her grow as well.
• Other noteworthy aspects is that Riva is very transparent in her progress. She works in batches and works from the easiest to hardest requests and delivers high quality pieces in a timely (very quick) manner.