Very impressive
There's a lot of detail in this piece of art which makes it pretty good. I especially like the scale on his nose.
If you look at it from a close-up (by clicking the picture) you can see the spikes to the side of his mouth being a bit hazy at the ends. If you would've made them sharper it would seem more like a dragon IMO.
The scales on his head make him realistic. With them slowly becoming a horn the more you go to the back of his head is a good way to make a horn of a dragon.
It's just a head though. I feel like a whole dragon would be more scary/impressive. With the white background and him (or her) lacking a body it feels like more of a sketch then a piece of art.
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