I'm a sucker for art supplies too! I realised a little while ago that I have more paint than I know what to do with and it's not even my preferred medium.

Books are another 'little sin' of mine as well, mostly secondhand though so there's that at least? Even after donating / giving away over 50 books I still had to have an additional 3 shelves put up to hold the ones I couldn't part with!

P.s. I love your illustration, especially the highlights because they really make the already bright colours stand out more :)