The model looks quite qood! I'm not too keen about the one eye though, especially because there appears to be room for two. I'd also do something else with those arms, but I'll explain later why.

Are there any final thoughts about the size of the sprites? I ask this because I've learned that not every model is good enough to be used as a sprite in a platform game. Especially large, narrow, nonfamiliar sprites tend to loose a lot of important detail when they're resized. (32 pixels is really a problem)

To show this, I've resized the side view version of your robot (to 58px, ) and already even without legs its showing some problem areas. The large arms for example are not recoqnizable anymore. Adding legs will make the loss in detail even more noticable.

There's no easy solution for this, but to check what things do when it resized to a smaller version.