CoreTechs:Tactics Trailer BG pan

Trying to paint up the first of the panning backgrounds from the CoreTechs:Tactics backgrounds. It's a pretty huge undertaking. I've never tried to tackle something of this magnitude before and it'll take some serious experimentation with painting style to get it to where i'm hoping to take it. I'll post progress shots of it as I go. Here's a greyscale of how it started and a shot of where I'm at now.