I took the time to think about it... and the missing thing (to my mind) is contrast.
in fact, there is two things disturbing me:
1-This gradient from yellow two blue wich I see the line you made with the gradient tool (even though you didn't use it) 2-The fact that lightning seems abnormal in every way. What does it point out?
the 1° tell us... that the 2nd sums up all my point of view: the blue zone indicate a lack of light, and yet the lightning source seems to be the sun. there is nothing between the sun and the subject wich can hide only this part of the tail...
I was also thinking that the parts of the dragon wich facing at us (I'm speaking obout orientations of surfaces) should be dark, and the parts facing the sun (so near from not visible) should be highlighted. this fact, mostly concerning parts wich ar in the sun disc. a picture worth more than 1000000000 bad english sentences: look at the cloud behind the dragon, it is totally "black".
in current state of the picture, light seems to come from the left side of the pic...
after, if you wanna add a frontal or lateral light, in addition to the sun, think about to increase common light zones, wich could be nearly white.
Now you can do what you want of these hints, if you have only understood the half! P:
o my days... that wikied you can realy see the tones and hilights of his scails and the glow from the sun hitting his back and the scails reflecting the suns light its like its right ther flying with the plane ( think of putting youre face agance the plain window just to see youre not seeing things) wow truey grate work ther hon
Very Impressive Gold Dragon. I really like how you draw D&D Dragons, this one is particularly radiant looking with the sun light off his scales. I like the clouds in the background too. His eyes are a very nice shade of green as well.
Well that obviously wasn't enough to clue me in, or I could have gotten it. Besides, once I misinterpreted it as male, again, probably from the only pronoun in the description being used being male, albeit referring to the commissioner and not the dragon, it didn't matter if the name sounded female, I would have just thought it as a male with feminine sounding name, it's not like it doesn't happen. Again, my mistake, I'm sorry I made it, and thanks for clearing it up.