I've been wanting to start an art shop, but I don't know how much to sell my art for. While I don't have too much recent art, I do have these: (All are made by me.)

I am aware that different types of drawings have differenct prices. What would be a good amount to charge for each? The kinds of drawings I'd be selling are as follows (animals specifically. Humans one day, but not today):

I am also aware that different styles can come at different prices as well. I can do both a more cartoonish style and something a little more realistic (not exactly realistic, but I hope you get what I mean. See top and next to last images for the difference). The more cartoonish style is far quicker, and would therefore cost less. I don't know how much less though. Frankly, I don't know a thing about pricing, so thank you for any help you can give!