I like the organization, and the room in general. but I think white for an arts & crafts room is a TERRIBLE idea. unless this is before you started arting and crafting the room!
Clean up your sewing room. How to Make a Giant Peg Board for organizing a sewing and craft space.
Paint holder: two wire shelves from one of those wire shelving units and zip tied empty thread spools in all four corners and the middle to keep them together, yet spaced apart enough to hold craft paints (kind of wine rack style).