I sell posters and also customize posters with spaceships which customers built in a game. Examples can be seen here: https://elyotdesigns.com/shop
This question is about the customization service.
It takes about 8-12 hours in total to draw the design for the poster. One middle sized poster costs 13,53€ ($16.33) for me to print (Print-on-demand)
I also have to pay 30% license fee for each sale because the poster is for the game Space Engineers and I promote them as official Space Engineers Posters.
How should I price my service? Is $65 including a middle sized posters overpriced?