I really love the composition and perspective of this piece. It is truly gorgeous, and really, really detailed. I think you did an amazing job on both the background, the dragon, and the unicorn.
However, I'd like to put in a little note for some issues I am seeing with the unicorn itself. Mainly, its a shading glitch, which is pretty much focussed on the front shoulder and barrel. By the looks of things, you have the neck attached to the front shoulder seamlessly, rather than having the shoulder wider than the actual neck base like it should be. Perhaps adding a little shadow to the base of the neck, then highlighting where the top of the shoulder would be would aid in redefining that particular area. And for the barrel, you have it appearing too flat. Again, adding some shadow this time behind the shoulder, then towards the hind end of the barrel adding more highlights and this time working on making the sides seem rounder may help with that.
And, if I also may add, the only other thing that is bothering me with this beautiful picture, is how solid you have the mane/tail and beard set up. Perhaps if you were to add more small, individual hairs you could remedy that. Here are links to some good tutorials I know for making manes and tails, which might just help you with adding the amount of detail that you have laced throughout this picture so wonderfully, to tie it all together better: [link][link][link][link]
I really hope I may have been some help to you, and perhaps aided you in your efforts with this contest (BTW, good luck!) Even with the minor glitches, this picture is perfectly amazing, and I could easily see you doing well with it as it is
coucou J'adore ton dessin Si l'un de mes dragon pouvais être si réel ^^ J'ai un dragon en préaration un occidental, il n'est pas encore passé au feutre noir, ni en couleur, j'ai hâte de voir certain amis qui veut le voir, s'il y le fond à leur façon ^^
No problem - sorry I left such a nondescript comment... bad habit lately! I really like the glowing purewhiteness of the unicorn standing his ground on what is clearly his (her?) territory. Looks as if he's one of the last pure things left in a world of impending evil and enveloping smoke.