The only way to get better at is keep practicing. I myself was never ever able to draw until i reached the age of ten where i had participate in a drawing competition for a calender. (The best one would be shown in the calender.) To my surprise mines was chosen but i'm digressing here so ill stop.
Then i used to practice my drawing skills and thats how i improved. Of course you can go about it a totally different way and join an art club where they will teach you all the different and correct techniques... then again who would go to such length to do that.
Also i occasionally find myself picking a picture from the net and drawing it freehand just looking at the screen.