Actually, if you put care into your screenshot, I feel it shows you probably also put care into your map. However, a good screenshot isn't necessarily some over-edited masterpiece. If nothing else, make sure it shows/gives a general impression of what the track is/is like. Usually, just the mere presence of the screenshot shows that perhaps a little more effort was put into the map. I see that this you have, and I encourage it.
Additionally, being involved in places like the forums and the general community is good. I'd never heard of you, admittedly, before now, but I'm going to go try some of your maps.