Clashing Titans

Trying to figure out how to do sci-fi, since I'm always doing fantasy and horror type stuff.
I'm probably gonna be tightening it up/ fixing some little things once I've looked at it with fresh eyes, yes indeed.

Was thinking of Medieval-knight-ish futuristic humans going toe-to-toe with Mayan-ish aliens.
Not that I tried to communicate that specifically, but it made for good inspiration, since I'm not used to drawing this sort of thing.