@ShahriarPerfect!
Another question: How did you make decals? Are they maps applied in Maya?
A friend of mine draw Hiccups for me, then just applied it to the his meshes, UV mapped correctly.
Toothless was the same way, I drew some quick scales in Photoshop, applied them to certain parts of his body, and took the same texture and turned it into a bump map and applied it to the scale textures.