I just wanted to say I love your work, your compositions are really nice. Having a portfolio site is a really great start, and you're on the right track with social networking, at least as far as I've been told. I'm just starting out myself, although I've been a working artist for most of my life. The most popular artists out there are building a reputation and making their presence known in a big way. Also, I'm not suggesting pandering, but it always helps to know what's popular. Choose a market and explore some popular themes, but find a way to make it yours.
I do have a couple recommendations for your work if you're feeling receptive. The best way I can say this is to compare and contrast No.5 and No.8 (titles are useful because it's easier for people to talk about your work). In No. 5 you have a really great landscape painting with a really nice sense of wide open space because you've got a lot of variety between the foreground and background in terms of color and brushwork. In No.8 you've got a really great layout and it ought to look deep, but it's not quite there because there isn't enough variety. The outline thickness of the mountain range is pretty much the same as the outline thickness of the animals in the foreground, so they almost look like they're on the same plane. You could also use some more contrast in your darks and lights.
I hope that's not too forward of me, since you didn't exactly ask for a critique. But, like I said, you've got some really great work. Good luck.