This is another tutorial. The original art is by Arkshay Sharma http://w-rage.deviantart.com/?rnrd=127443
The start was a fan art piece, of course you can use your own, but I love to collaborate with fellow artists and illustrators.
The process was in digital media, any programs that allow to work in layers will do.
Or traditional media can also be used. You will be surprised how inexpensive creating art can be!