This is probably the illustration that I'm most happy with for the Powers Beyond RPG. It's available in both print and PDF from Lulu.com, by the way. It's a pretty good book, so it's worth picking up.
This equipment illustration took a lot of hand work to redraw all the crisp lines. I also tweaked the colors. I suppose I should mention that this -- as was all of the work I did for this book, was created by combining multiple passes from Daz Studio in Photoshop. Weapons and equipment are all 3D assets purchased from Daz3D.com, except for the little power-cell cubes. I created those from primitives in Daz Studio.
As for why I like this one -- I think the simplicity and clean lines just work.