Hmm, you have a very clean and smooth af style, which definitely pulls up the price.
It kinda very much depends on how quick you are, how big your following is, and if you have some loyal regulars you can rely on to come back to you now and then, so I can suggest a price range, and you can choose based from where you stand.
I'd say your fullbodies should go for a minimum of $25, but that just being the very base price where you can add on to it if there's more details or features you struggle with drawing. So 25-30+ ish.
The headshots are fairly simple but still really smooth and clean, so I wouldn't shy away from 10-15. 10 for simpler characters and 15 for characters with extra detailing, such as big horns, intricate jewelry etc.
If you're comfortable with doing intricate and or action'y poses, there's always the option of adding on that in the commission info where you can offer to draw the characters in more dynamic poses for a little more money.
You should also consider increasing the price if the characters include big and significant details or accessories, such as wings, intricate patterns, weapons etc.
Other than that I wish you good luck with replacing your tablet before it bites the dust! Good luck with the commissions as well!