This is a nice idea and well executed but your need to clean them up a little.
The flash and obvious left overs of the sprue gate are very visable on the helmet and the end of the pulse rifle. Just slice them off with a scalpel blade and your be set to go.
Nothing worse than missing some mould lines of bits of flash and not realising till you've started painting!
I did that myself the other day with a krieg trooper. Spent hours cleaning it up, washing it, building, and priming to to see a mould line in a really obvious spot i missed... doh!
EDIT- Actually If I were you and you wanted a more japanese foot soldier feel I'd remove the helmet (gun drone) and slice down the Tau head a little more so that the rim of the helmet is covering his eyes a little. These style of oriental hats often cover or just cover the eyes or face. Right now it looks a tiny bit too high.
This will also help to make it more like a hat and less like an item just placed on his head i.e a huge gun drone.