It's likely that the white outline is from an area that only has slight alpha on it (eg, didn't use a hard edges brush to remove it). Try making a black layer under your texture, and see if you can see the white outline, then clean up the texture however much you need to
When I made my skin of it, I drew guides and wrote in different colours the various sections on the body texture, as some points I had to make the grey/silver/chrome metal while others keeping black, I'll see if I can dig it up when I get home. Also, you'll probably need to make the textures from scratch so it could be uploaded here, just to avoid all that legal crap. I'll need to do some small editing on mine, as the torso uses some parts of the original still (chest namely) but it shouldn't take long to make my own, as I did start it AGES ago and have since got better at texturing in general
This has reminded me of a reskin I did of the terror trooper awhile back, might upload it here as we have new file policy's that would allow it. EDIT: Screenshot ingame
Skinning a face/head from scratch was pretty ambitious for me, I would like to hopefully also try a torso/chest as well at some point, but my time constraints is mostly due to homework/revision
Now to fix up my layer masks so it looks more like skin is showing through, rather than it blurring at the edges Well, I wouldn't mind having a small goatee modelled onto it, but I would highly doubt that such a small request would get taken up