Original image

step 1 of 3

step 2 of 3
then added flames, smoke, shadows and reflection and some other details, adjusted colors and got the final image.

step 3 of 3
for the scales i used cut,mirror and warp, then duplicated several times.
when i had all the scales i thought it would be a bit more spectacular if instead of simple bone scales i'd make some flames.
for this i colorized the scales, used smudge, levels then deleted some parts with an 50% opacity brush, duplicated, colorized again making it red this time, then changed layer with red flame to overlay blending mode and i had the flame.
something like that anyway.
there's probably an easier way to make flames, but since i already had the scales i thought it would be nicer to simply use those.

Final result

