You've entered the domain of N-art, and you can think of me like the master martial arts instructor in Kill Bill. I may be a dick, but my advice is solid. I'm trying to stress that over time, with resolution, you can train yourself to do better. Try taking a looong time (2-3 hours) on an N-art. Work out all the flaws; perfect your z-snap lines; work on your shading. Then submit it. N-arts cannot usually be rushed. I mean, I logged off for 1.6 hours to watch a movie and I come back and you've added 2 new arts to your list.

And feel free to ask me if you ever want me to further elaborate on my criticism (or praise, who knows what will become of you), or if you have any other questions.

He's criticizing your maps. At least he's giving reasons why he doesn't like it, and he's telling how you could improve it, which is better than just saying it's good in my opinion.
Insulting a map would be saying "It sucks" and not giving any reasons why it sucks.

As for the N-art, it's not bad, but it's kind of lacking, because there really isn't much to it.

I am positive you will over time develop a steadier line and get more innovative!
Check out my narts! http://nmaps.net/browse?q=n-art%20author%3Achad_sxtn13