I like this art style, the super saturated colors work quite nicely with this render of Rainbow Dash. Great work with the gradients too; they compliment the piece and add depth and volume where they need to, and they're subtle, they don't blow out the piece. You balanced the gradients and solid colors perfectly!
I usually hate when people just comment "cute" on pictures, but this is pretty damn cute. the colors were nicely chosen too, it can't be easy to keep the range of colors of rainbowdash as soft as this turned out