Hi PDN Forums!
I've been a lurker for a while, using some of the tutorials. I finally decided to sign up. I've been using PDN for a few years now, and I find it quite entertaining.
http://i.imgur.com/cejarZ3.jpg (full size,1657x1415)
So...considering I missed a few shadows in the first attempt, here's the second. I changed out some of the gears so they will actually mesh, edited the colours just a hair, and, of course, added the missing shadows. I also edited the background a little. All the lines in all the textures were going to same direction.
http://i.imgur.com/fiDe7Ry.jpg (full size, 1625x1474)
Here's a design I used for my tattoo a few months ago