This is one of my favorites from your DA gallery. :3
The colors really work excellently together. And there's a good reason red is the 'obvious' color - and that's because it so often works. I like how the linework on the dress is tinted differently. I think thta's part of the reason it looks so great.
For critique, the arm looks slightly stubby and slightly thick, though if the picture were full-body it might work better.
You should draw Eu again. ;)
Oo.. Beautiful. Lovely lineart! I love how it changes colour!!! It's also very very smooth =D
Colour coordination here is loved and she looks cute ^^ I especially love the shades on the clothing, and definitely love the background.
Very nice pict! XD