Good to see you're still working on stuff, Delphinium. I have two suggestions for you on your latest images. The smoke for the shuttle could use a very small depth biased alpha (called Depth Blend Falloff) I think. This will cause the particle billboards to fade a little bit when they collide with a mesh, like the control tower and launch tower, and prevent that clipping appearance that looks really sharp. The zealot looks really cool, though I feel like his attack animation could use more smooth of a wind up before he starts swinging.
Looking forward to seeing your future work!