The best way to improve your drawing skills is to practice sketch drawing. It doesn’t take you much time to practice it and will allow your creative brain to do the work. The technique consist of executing rapidly a freehand drawing. The artist usually use it to record quickly an idea. This way isn’t expensive and the artist can try out many different ideas before painting it. Logically if you draw the same object many times, eventually you will end up drawing the object with your eyes closed.
Do you still don’t believe on the power of the sketch drawing? This technique have been done by many famous artists as Leonardo da Vinci with his sketchbooks. I wanted to practice this technique while blogging. I found this wonderful website, sketchfu.com, where you can practice your drawing and share your work with other people. I will tell you that some of the sketches are quit impressive! If you click on the pictures (below), you can see how it had been done. Happy drawing 
Dorothy from grammology
I don’t practice as much as would be helpful. Doing so much on the computer these days so I will visit the site you suggest. Thanks for the post!
Pam Hoffman
http://seminarlist.blogspot.com