I love the imagery! Especially how both figures are entwined like that.
The darker one looks particularly amazing, and it's easy to tell that you put a lot more time into it, which isn't the say the light one doesn't look good (it does) but it lacks the fine details.
I think it would look better if the light one's wings weren't so darkly outlined though.
I love the concept of this image. It is so elegant. The shading has been done just beautifully, and I admire the creativity put into the dragons. In my opinion, the only thing that could be improved would be to have the light one's eyes showing. That might make it appear more "good".