I'm not any good with Photoshop myself, but this article on Designer Daily has links to fifteen different steampunk-based Photoshop tutorials. Judging by the images of the finished products, they look really amazing!
If you're into steampunk and aren't intimidated by Photoshop like I am, I think you owe it to yourself to check these out. Here are some of the images you can create by following the tutorials:
Have an iPhone? Check out all 200+ new features coming in iOS 13.