Overall

Vision Vision

Originality Originality

Technique Technique

Impact Impact

First of all this is a awesome piece but you wanted serieous critique on the colours and shading technique so here it iscolour choice:i think you picked, on most places, the perfect colours. they really reflect rarity and i love the ombre look of the blue dress. If you are looking at contrast i have troubles with the purple underdress because it is exactly the same colour as her hair. maybe a little bit darker purple or a dark blue would give it a bit more contrast.also the contrast with her left leg and the backside of the blue dress is missing. it would give it a bit more depth if the inside of the dress was a bit darker.shading technique:i think you did the shell shading really good especially if you know you don't have much experiance with it. for improving it, you could make a little bit more details in the hair with the cell-shading. you have light parts and dark parts with a shine on it. but a little more detail with shell-shading makes it a bit more fitting with the rest of the drawing.the last thing is the stiff feel of the blue dress. i think it's because the most upper fold of the fabric. it's falling not down but a bit to much to the left. because it's not falling naturally it makes it feel a bit stiff.I hope this will help. if you have any questions you are always welcome to ask