Not bad stuff here. Needs work and practice. A lot of colours used for tattooing take different than pencil crayons if you know what I mean. Transitional effects with a pencil crayon may look good on a piece of paper, but it's actually somewhat of a taboo. Overworks the skin and it could look completely different than what it should've. Good solid chunks of colour with basic vibrant colours are always a pleasure with well defined lines. Start going over all of your final work with a solid felt tipped pen or something. A lot of art stores sell fucking amazing fine points I use. These lines are easier to do stencils with when you're tracing them to put on a piece of skin.
Other than that, you've got some decent potential here. A lot of this work has the "old skoo" feel to it. I like old school tattoos myself, but try and draw a massive array of shit you would never ever think of. People will come to you looking for an artist to draw the dumbest shit man believe me. Draw dudes with unicycles and meteors raining into pink water I dunno people think up some stupid stuff, but you gotta be able to draw that shit professionally if anyone's gonna buy your flash.
And since it's such a competitive industry, you gotta beat down some incredible artists or you don't make your bread. Your portraiture needs work so lemme see some progress here. I'll check up on ya and maybe post some flash of mine. Keep at it man you're in the right direction. Talk to me if you need any help getting in the direction of putting ink in skins y'know?