the anatomy is a bit off to me, like the neck and the head. I'd base the price off the amount of time you put into it and detail. I'd say 700-800-ish for you.
if it's the colouring that sells, it sells; the chibi is still very cute. but like with what computertrash had said, selling your art on tbt also depends on how frequently you can churn out a piece of work; you probably won't want to keep people waiting for longer than a week. Keep it up ^^
oh my gosh, your art is gorgeous ;v; definitely 700+ TBT, and i am most certainly eager to get some art from you! if you do RLC please let me know, i really want your art gdfglkjfdg