Well I'm no expert in this sort of thing but your art has a rebellious tone, in fact a cult tone as with the picture of the Manson Family. That is who they are right? So I believe the audience is narrow. However I'm sure there are people who are into this kind of art and perhaps someone here can help you with suggestions of marketing them.
I can't tell what media you are using. Are they drawings, paintings, or digital?
As for myself, I'm just a hobbyist and don't expect to make any money so I haven't researched that avenue.