I am an onion. I've painted them until I've become one. This is my favorite and last for a while. Here's what I've learned: 1. you can't please everyone (see yesterday's comments). 2. the main thing that's tough about onions is the values and colors shift subtely across the onion, and I found the easiest way to deal with that was ... 3. scrub in a kind of mid color first - then on top of that paint in the parts that go lighter, darker, grayer, etc. That way you have a starting point, and something to compare to.
What's funny is I got a lot of comments suggesting I paint in the lines on the onions. It's funny because I never even considered that when I was painting them. You see, what I LOVE about painting is suggesting what I see ... interpreting it ... suggesting. This one is my most realistic I think, and it was a stretch for me. I also got suggestions to find the onions with lots of layers peeling off, and I'll try that at some point, but these were pretty smooth. And yes they were really that color.