I think what you have achieved is very good considering the impressionistic style of your work.
Have you considered to begin with though, just using simple tattoo flash designs? They may not be your taste in design/style but I think this will help you to master your lining and colour fill, and shading techniques -
and then you can put those techniques into practice to create your own artworks?
Please don't take it as a criticism - I think your work is very intriquing - just think it may help your techniqes overall