Hmm... angular, you say?
Well, I guess I was bound to do something wrong, I've never drawn anything this big. I actually think it's not angled enough. You should be able to see a bit of the other side too, but I drew it like this because it has that angled armor at the front. I'll do my best to improve it. But for now, shading!

He's saying it looks odd with perfectly defined and straight lines. Try to add some variation if possible, or shade it so that there's a less apparently perpendicular intersection.

I'll try to shade it so that it fits in better with Ivan's Guardsman sprite.

I just remembered to tell you that the guardsman sprite is using a bit too dark shade of green imo. Not a big thing, but I thought I'd point it out anyways.

[Post removed by myself for being stupid enough to double-post]

[above:]That's one thing I'm not going to fix. I'm not messing with Ivan's shading.
How's this for shading?

Looks great!

Ok, I'm done with the Sentinel's body, I only have to make the legs and guns. Drool over your future cannon fodder:

Nice stuff there!

Should I also make the Cargo version of the sentinel?
The one with two smashy arms?

Sure, if you like. It could be a bit hard though.
Anyway, sentinel sprite. I think you should lighten the black lines quite a bit and then shade them ever so slightly. It'd look a bit better.

THIS IS SO MUTCH BETTER THAN WINGWOLFS GUARD

No offense to Wingwolf here, but these ARE indeed SO much better than his guard

Didn't know that one existed, but sure go ahead if you want to, especially if you could make the arms work like bashing weapons, would be cool.

I'll give it a shot, but I doubt there's a darker green in the palette than the one I used for the rear. Looks like people like the idea of having sentinels... I hope I won't let you guys down.