your art is great! for a headshot, the typical price is around 1k -2k, but i’ve seen as low as 750. for the fullbody, i’ve seen usually seen pieces go for 4k+. some people charge extra for backgrounds, some don’t (it’s up to you tbh).
honestly, your art is solid. i would feel comfortable paying 1.5k-2k for the head, and 4k for a body.
that’s my opinion. i’m not the best when it comes to prices, but the numbers i put look good for me. if you aren’t satisfied with them, do whatever you want, it’s your shops after all