I love these vibrant colors Rita. This is really gorgeous. If you wanted to, you could push that 3D form just a bit overall, by getting that right and bottom-right side darker, and the highlight area just a bit lighter. I tried to do this a bit in photoshop to give you an idea of what I mean. The original is on the left, and the one with some more darks is on the right in the image I added to this comment.
Wow!
thanks @pgthompson so much for taking the time to demonstrate this- I will definitely work on this some more