Yeah, I know that Black, I mean some element need more retouchment, the arm & the leg he need more details. For RX the head between his shoulder are way too wide, it makes his face looks smaller. Other than that he's good. I presume it's because you're not fully finish it, right? I'll wait for your next progress if you're going to, & looking forward to your next drawings.
ya kinda... but origin Black is really looks like manga/ SIC.... as for RX, there is no manga (origin) if not mistaken...so the Toei (?) TV station made it looks like this...means more like grasshopper motive.