It's absolutely not necessary to go buy a giant workstation to make 3d models and hasn't been since about 2008. You can probably do the work you need to do on that machine quite comfortably - I used a worse one when I was working on first party PS4 titles. You may want more ram for zbrush but in general I'd suggest not…
I think you could refine how you compose the shot. What's the viewer's intended focus? How do you lead their eye? We have some nice guides here: http://wiki.polycount.com/wiki/Concept_Fundamentals#Composition
NegevPro Believe me, I've played them. I remember back in the Halo days people always tried to get me to play battles maps for some reason, that was no fun at all, and I would often get bored in seconds . There weren't that many sights to be seen nor were there interesting fellows. As that one tropes lady would say "it was…