ink skull 2 by AndreySkull.deviantart.com on @DeviantArt
Nitrinos Predator Helmet
Pocket watches are still popular in the modern world, and here are some pocket watch tattoo designs that you might consider:
A mind-bending 3D tattoo by Tony Booth appears to turn this man's arm into a machine.
pocket watch tattoo placement
3D mechanical arm temporary tattoo stickers by lovetatoo on Etsy, $11.50
#3D - amazingly excellent work. There are some great artists. http://hdtattoogirls.com/search/3d+tattoo
Awesome Skull Sleeve Tattoo - http://giantfreakintattoo.com/awesome-skull-sleeve-tattoo/