Finding a sense of style

So as I've previously said, this summer is about trying to find a consistent style that fits into my natural ability and media i'm using. I've posted some things i've been doing but it seems that my "style" keeps changing although i'm starting to see reoccuring patterns coming through. With working in print I will be working with quite bold, graphic illustrations and so I've started to work in a more pattern/shape way that I really like the look of.
Here's some I did earlier:

Gal

Guy

One Flew Over The Cuckoos Nest - MacMurphy.

Frog

WIP

So like I said, I'm really happy with how these are turning out, I'm concentrating on shapes, shadows and shadesand think it works quite well. The only problem I keep thinking is that I haven't tried this style with any background illustrations, only portraits or similar. So that's my next challenge, I want to get a slightly more relaxed style of this for quicker drawings or full illustrations.

Like always any feedback is welcome!