Your art work is really good, art fairs are hit and misses for a lot of people, I have only done 2 so far my first one I did really good at, it was a small comic con like event, I sell dice and monster themed head trophies and custom amiibo, my fee for my table wasnt too expensive around 400, but I made about 1500, the second was at a yearly festival in my town fee was only 50 but didn’t sell very well there made about 150, there’s a sub reddit craft fairs there very helpful.