The second one down has some Georgia O'Keefe qualities to it, and the fourth one reminds me of an illustration in the children's book "Sea of Grass", which won the Caldecott medal in its first printing.
I'm with Paige...I have never mastered watercolor. It is much tougher than it looks to do well.
Just a couple of suggestions Em, these are what my cousin did.
1 - Go to your local art shops (ones that sell paintings) and ask them if they will sell them for you or buy them off you.
2 - Get them in nice frames and ask at local restraunts/cafe's if they will put them on the walls with a price on and your phone number. This gives them some nice free artwork to cover bare walls and you get loads of people seeing your pics.
I'm an ebay power seller and sometime we get newsletters with success stories etc. A few months back I got one and the success story was an art student selling abstract paintings on ebay at huge profits, in fact he was doin so well that he had to employ some friends to paint too. He was grossing several thousand a month and still going strong I believe.