Actually that’s about right, maybe even low for an original. At Cons and Ren Faires work like that goes for between $100-300 depending on the size and popularity of subject matter/artist. I have prints from artists like NeNe Thomas and Ruth Thompson that I bought for $75-100. Some of my NeNe pieces are worth thousands now and these are just prints not the originals. If you matted and framed it then it could be sold for even more.
Looking for Blue Fawn Baby Kirin
Sanguine Oriental Test Paints, kinglet
Sun Dragon Koi #3