We had to make story out of lemons and deers, and being the eccentric people we are, we came up with deers eating lemons and pooping lemon tarts. 
I personally worked on the above piece. I think the hardest part of it was the get the right shade of the paint. I usually started with the lightest shades then start adding darker colors when i needed a darker shade, but the problem with this was that if i wanted to touch up any of the lighter shades I will have trouble mixing the paints to the exact shade and color I need. But on the whole it was a very fun experience just playing around with the paints.