They all look nice, the style is strong, but I'll agree that they look too similar. They're all two- or three-color on black, one bright color and one lighter muted color, usually complimentary, same outlining style, similar shading styles, and I imagine they're all roughly the same size in the same position once they're screened.
There's nothing wrong with defining a style for yourself and working to strengthen that style, but if you're working professionally then be wary of two things. First and foremost, if you're restricting your work that heavily, then you leave yourself with far less space to manuever in and far less space to grow. Secondly, be extremely careful about all of your work fitting into that style, because down the road you'll realize that you've pigeonholed yourself into an extremely niche (and gradually depleting) market. You don't want to have to find a new job in two years, just to look down at your portfolio and realize that there's little depth or variance in any of your designs.
All of that said, they really are nice. I especially like your type (with the exception of the most recent one) and the way that its forms complement your image.
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que faire quand on a tout fait, tout lu, tout bu, tout mangé
tout donné en vrac et en détail
quand on a crié sur tous les toîts pleuré et ris dans les villes et en campagne
