Hi! Thank you for your interest 
It’s hard to pinpoint what the final price would be as the complexity and time required to complete the commission can vary greatly, however, I generally start charging at about 20 EUR (22 USD) for a headshot of a single character. I have updated the original post with the estimates.
I invite you to send me a DM (preferably on Instagram, if you have one) where you can describe the specifics of your commission, and we can discuss further arrangements.