That's nice work! I like the desktop a lot, my only recommendation is that you could use the feather tool to make the pencil less jaggy on the edges. And the second one is great, too. I think that you could add more of a separation between the sky and the water, and maybe blur the clouds in the background more, so they aren't so obvious. But, other than those few things, good job!
Edit: After looking more closely at the second one, I think that you could also make the clouds in the sky darker, so as to add more contrast between them, the moon, and the water.