When life hands you lemons just make lemonade and don't bother trying to paint them. Good lord is there anything harder to paint than a lemon peel? The reflective surface of the lemon peel picks up a myriad of colours, ones you didn't even know were nearby. After trying several different setups I went with something I thought would be completely safe, white on white on white background. Sadly, that lemon peel still picked up colours from I don't know where. Outer space probably. It's not exactly a problem for it to reflect nearby colours, it's a problem when you try to put it in the painting and it smooshes around with the yellow. That yellow does not play well with others.