Beautiful pastel colors. I like the soft, calmness this image conveys. Great materials. Looks like some SSS on the larger object. Your sense of color coordination is very good. All of your renders, I have noticed, make good use of color.
I would have never guessed they were of the same geometry. Great little trick there, and excellent effect. What did you use to render? Blender cycles, or... ? There's some really nice color bleeding from what appears to be translucent materials, and the results are nice and "smooth".