Today, I added the 2nd painting in the background (but it is ... Floating Apple, of course), I put in the onion's shadow (I'll need to make that darker), and I started working on the box.
At this stage, I think I can bring the onion back to the kitchen. All I need is the box. Still not sure how I'm going to paint the pattern. The more I look at it, the simpler it looks, but maybe I should try it out on a separate piece of paper first.