I rarely review things on the frontpage, but this one is a nice piece.
On the tecnique used, I gotta say that there is basically almost nothing that bothers me, except those little triangles plates on their shoulder. The one in shadow looks bigger than the other one in light, in both poses. The colors are greatly balanced, but I would make the cyan of the "crown" less bright (just a little), but even like this is great.
On the creativity used, I gotta say you nailed it. I mean, esthetically it doesn't seem something special, but the concept behind it (brothers and heir) is awesome!
I would have liked it even more if you gave them something that express more this idea, because at first look it just looks like a three headed undead. Giving them some emotions would be great, but I guess is not easy when you are using a skeleton.
By the way, it is a very very nice drawing, and for once I'm happy of what I found in the frontpage.
Outstanding!