Like the subtle glow better, and the faded gears. The last three flats layouts are too confusing and hide too much of your work. The first of those four is the best layout. You could use that last 1/4 of the image to add something, maybe a shot of the shader, or another wireframe. Doesn't make sense to include the height…
@Eric, let me ask you. Looking at professional websites, I don't see a lot of folks showing off texture flats individually. Full texture flats seems to be more prominently displayed (and relevant) on sites like Polycount; where artists are learning from each other. More often, I see professionals display their textures…
Model and textures look good! But you're asking about the presentation. I think it could be improved. I'm not getting the reason for the "gears" background design. Doesn't fit the theme of the model itself. My first impression was smoke coming out of the barrel. Then I thought maybe it was the revolver cartridge. But it…