If the idea is just an outline I'd suggest drawing the tattoo's lighter and make sure you have the right size and position. By the shading of the eye area it would seem you have trouble with eyes? If so keep trying the main aim when looking and drawing eyes is to concentrate on the shapes and measure everything, that is the one thing that changed my drawings from average to great (not to sound big headed or anything - thats what I'm told) but yeah just keep with it and try adding more detail, you have the shapes just about right so now all you got left is to fill it in, Keep it up!