Well, I have a decent machine for M2TW I think. I'm running everything at 1080p (1920x1080), graphics maxed out, except Anti Aliasing which I turned off in the game options by recommendation. I use 4x Anti Aliasing from the NVidia Control Panel instead with the Kingdoms.exe.
Something doesn't seem right from my experinece with the mod. Your screenshots look like they're taken from a different game mate. Are those unedited screens?