I totally agree that this is an amazing piece! One thing I've noticed about your drawings is that you tend to keep them really dark... I think if you lightened them up a bit more then they would be easier to see but this one is more of a silhouette so I totally understand that I love the pose and the expression!!!
In other words, it's the resolution on your computer that's the problem. If I were to brighten this to make it look any clearer for desktops and low res laptops, Nirvana would actually have to be made grey.. which is not correct.
Hmm. Well it's a big explanation, but it mostly has to do with clans. In my comic I refer to Night Furies as Shadows, unless it is humans refering to them. There are actually 3 main groups: The Southern Shadows, Sea Shadows, and Northern Shadows. The South will be a regular warm climate, Sea: coast and underwater, north: snow, ice, and mountains. The Rebels will show up later in my story. They do not support any side and they accept any fury, no matter what clan they come from. Then there are the lower classes, which are clans such as the Forest Shadows. Hope it's not too confusing ^^' Choose any side, except for Sea, since they requite gills...and will be, well, gone soon. For more of an explanation: the ones from the north are most probably the good guys, but they suffer alot! the ones from the north are bad guys. Rebels are against humans while the north is against the south and vice-versa. Ask me again if you are confused
I have to say, Nirvana would probably be a Rebel XD But she wouldn't admit to it(she can't stand labels). The way she is, she's not anyone's sidekick or messenger. She HATES humans and if it weren't for Toothless, she'd have killed Hiccup on sight. However, although fair in attitude toward any other dragon(unless they steal from or attack her), she prefers to carry out tasks herself as she works better that way. She's more of a leader.
Saying all that, she sounds positively evil or selfish XD But she can be all cuddly and curious like any Night Fury in the movie.
This is really pretty and you should be proud of it because wow!!!! Nirvana's posing is perfect and gives the exact mood you're trying to portray: the watchful but ready-to-launch mood
The colors are VERY well balanced, you used a nice-colored glow (instead of pure white or yellow!! thank god) and the fact that the background is dark red and not black is great and makes the harmony that much better 8D!!!!