I'm super not a pro, but it really depends on how long the above would take you. I'm thinking probably somewhere between the 10-12$ range? Get second opinions.

you could try starting in the $6-10 range and if slots fill up fast, raise the price later on? (i mean for later batches)

I'd say about $8-12, I buy a lot of Chibis and that tends to be the going price for them. :) Also, love the eyes on this! Great work! :D