The only way to improve your skills in pretty much anything is to practice. I have done lots of practicing. I literally have hundreds of paintings. If you're interested in viewing just a small sampling of my work, it can be seen on my gallery website: http://rasquier.com and also a sampling can be seen in my Etsy Shop: http://squier.etsy.com If you see anything you like ... just ask, most likely it is for sale.
Some people wonder if it is hard to part with your paintings. The answer would be yes, in the beginning. But now, the answer is no ... I don't mind selling my watercolor paintings. I am happy to share my art with the world.