Oil Painting 6 - Color Still Life

First color still life! But blehhhh...not a fan. So it turns out mixing colors to create shadows and highlights on objects is harrrrrd, especially when you're not allowed to use black. I got pretty close for most of them, but the back wall eluded me -- it's supposed to be grey, not purple-blue. xD I haven't received my grade back yet for this assignments, but I'm definitely worried about this one, mainly because of that back wall.