Welcome to PJ!
I'd say you've got some great sketches here. I can't offer you much advise career wise, but there are plenty of people on here that can help you. Loston (aka Bruce Lee), Inkthinker, Paul Maybury, Kaligula and many others are all working in one capacity or the other and can possibly offer some great advice for that.
Art wise, I'd say you're on the right path. The one of the woman have great movement and energy. And the head sketches are excellent. Just keep plugging along and hopefully, something will drop your way soon!