RainbowCycle

I think you did a fantastic job with this. The color pallet is nice and there's a good use of bright'n vibrant colors (as to be expected when you think about flipping-Rainbow Dash, heh). I feel like maybe there should of been a transparent-rainbow worked into the background in the sky or something because while I'm adoring the background it looks a little bit on the boring side. It's just a very calm and surreal looking composition. (I think a random explosion in the background might be exactly what this is missing, lol)

The shading and highlights all look spot-on accurate and those "god-rays" sunlight coming from the top left was a nice touch. Anatomically speaking, everything looks fantastic, the only thing that might look slightly off to my eyes is her upper torso, it looks like it should be a smidge wider like, her upper body is a tad on the skinny side. Lastly, I imagine the bike should have a little more... "flare" maybe a decal or two somewhere.

So, aside from some nit-picky, extremely minor, possible issues and a slightly "plain" looking background there really isn't anything wrong with this. It's a brilliantly stunning piece of art work and you should be incredibly proud. Major props. Kudos~