Wow! This piece of art really caught my attention! The colours and ponies are reaaally beautiful! The blending and mix of these colours are really the best part of the art. It gives off an extremely warm yet colourful feeling. The clouds are drawn wonderfully, they look very soft and the pink and orange tints match especially well with the orange pony. If there's one thing I have to say, it's probably the blue ponies tail. I feel that using slightly brighter colours you can give it a better 'pop' to it and since her face is close to her yellow bangs, she looks very pail. The ponies look like they're standing, but maybe they'd look cuter if the pose looked like they were lying down? But honestly, the clouds and the hair and the soft shadings are just absolutely beautiful. Well done.
The colors you used for the sky and clouds are unique. I love how they compliment and contrast all of the other colors at the same time.
I like how you made Fluttershy look graceful and beautiful even while she's asleep.
I like how Rainbow Dash is resting on top of Fluttershy instead of next to her. I like how they're snuggling.
And the way that they're both smiling while they're sleeping makes me smile.
But I did notice that Rainbow Dash's tail colors are blended together in a weird way. I know that you were probably doing that to make it reflect light, but that's the only thing that's strange in this picture.
This is absolutely wonderful, i adore the way you've drawn and colored Fluttershy and Rainbow Dash, they look so serene and graceful, this is certainly one of those pieces of artwork that brings me a big smile, exceptional work .