It could be the angle of the picture, but in the one where he's flaring, it looks like he has the gill plating that's common with dragons. Dragon scaling is basically a thicker, armor-like, scale over his body.
I don't think he's a dragon, just a masked. He doesn't have the thick, powdery scales dragons do. He's gorgeous, though! I think Orchid would be a good name. I know it sounds girly, but his fins remind me of a flower.