Back when I started drawing in 2007, my ability was virtually nonexistent. I decided that the best way to improve my ability would be to draw images every week, and for a source of inspiration I used a D&D campaign that I was playing in. Each week I drew one or two images of events in the previous session, and kept a running diary of my progress on my website. In just over a year of practice, my ability jumped from this kind of thing to the kind of image you see here.
I keep this image around to remind me how much regular practice really matters. During the times when I spend a significant portion of my time practising my drawing (such as during March), I get significantly better.