The landing page has also been talked about, but I also recommend reorganizing your Illustration page - kinda like your stickers, by theme and maybe mood! It's no big problem to have them in a slightly random order, but it's more memorable if you don't have the monochrome pictures "break up" the line of colorful ones.
I also recommend having commission examples in the pricing page. A buyer already knows your style, but they might be discouraged if they don't know if your portfolio examples and commission categories are one and the same.(for example, if you offer colored sketches, the fully-rendered pretty art might leave their expectations different than an example of exactly what you're selling)