My first attempt at oils was with an orange. I really enjoyed using different colors for this and showing the texture of the orange. At first I had trouble trying to paint with oils because I either found it too thick or too watery, but once I got more comfortable with it I was able to paint a better orange.
My next piece was painting an apple with a pallet knife. I had a hard time using a plastic pallet knife for this and I feel like if I worked on this more I would have made it look better and more realistic.