@Clash and Gears, Thanks guys, that makes me feel better ^^

@SaRuMaN, Look just because I say it in a different way doesn't mean I b**** about it, I'm saying that they don't have proper perspective because none of them have a vanishing point, and most of them are the same, dull, boring-looking stages. I suggest that you learn some perspective and you learn not to judge people.
If you don't know what I mean by Vanishing Point, here.

The dot in (Supposedly the middle) is supposed to be used for the ground and other parts of the stage in a viewing perspective.
Like so,

Then you choose where the sun is and start shading using the light source, I haven't done shading yet but I have coloured it in.

v.v

You're all right, I suck, I know, lol.

You don't suck, you just need some improvement.

Yeah, that too xD

My latest work:

I'm not sure you understand perspective yet. Read Nicko's post again. Pay attention to the text between the first two images.

You should be using the vanishing point for everything, that even includes the lamp - to an extent =p
Other than that it really isn't that bad.