I really love the cool shading and just the general cools and warms that you have captured in both figures. Cool shadows where the figure is about 3/4 or 4/5 covered in shadows and 1/4 or 1/5 actual/normal lighting are really hard to paint. And the metal texture is really amazing.
Some small critiques I would point out is that it feels as if the claws on his left hand are floating instead of grounded. Perhaps have shadows with thicker edges closer to the tip of the claws and they gradually get blurrier the further they are from the ground. Another would be to slightly darken the edges on the older man's left side of his head since it seems to flatten into the background. Just some suggestions.
Nice to see yet another awesome piece of yours, haha You did a neat job on details, and you notice it surely, too, but the elder ninja's face looks like a 3d render! Ok, I don't say anything more... *shot*
God you draw both gorgeous women and such dashingly handsome men! Young and old! Beautiful work with all the details and colors! Those flames are so magnificent! Really wonderful work Vicco! I am sure the client was very happy with this wok!