Your drawings are really nice. You have a good understanding of light source. I would really spend some time looking at the classics, because once you get those fundamentals down and learn the mechanics, you'll be able to experiment with lots of styles. The obvious starting points would be Cap. Coleman, Huck Spaulding, Paul Rogers, Sailor Jerry, Stoney St. Clair, Hardy, Zeke Owen, Thom Devita. Then from their, Dan Higgs, Filip Leu, Timothy Hoyer, Grime, Richard Stell, Scott Sylvia, Lehi. And then dudes like Danny Reed, Andrew Conner, Will Lollie, Brian Bruno, etc. Immerse yourself in these people's work, b/c they know what tattoos are, and they know how to make them. All this hot shiny stuff that people are doing now won't hold up over time, so enjoy it for the art. A tattoo should look like a tattoo. But, this is just my humble opinion. I know there are many others.