NotAn...

Oh come on. You are not perfect, i am not perfect, no one here is perfect. But there is nothing good on blaming your imperfections on everything else. You are learning it's not Mineimator's fault that you didn't do the best lighting (look at some other wallpapers people can do truly amazing things with Mineimator), the lens flare just doesn't look good (And the light outside isn't even white so the lens flare also shouldn't be white) and the pot is flying because you can see part of glass at the bottom. If you actually admit that this wallpaper wasn't perfect and look at the parts you could do better you will improve much faster than if you just say everything is perfect. The wallpaper isn't even that bad for someone new.

Oh.. well this is just.. perfect!

Bit less editing and bit more posing. Basically what everyone else have already said/

Neeeeat!

Ayyy, something that looks good.

maybe

Ooof, you have taken a risk. The wallpaper is alright, Clyde's (the purple rabit's) pose could get some work, but as i said its alright.

So the character: the colors seem all over the place. the webs on his arms glove things and shoes also seem a bit out of place. what has happened to the eyes? the black and brown thing around his stomach also seems a bit out of place. just my opinion, but round objects (if not done right) don't really fit in with minecraft's blocky nature. For this just try to be more consistent with the whole character and don't put too many random colors. Lighting: there aren't really any really visible shadows, so it looks kind of unrendered. Use spotlights to make the scene look alive. Posing and how it looks together: it doesn't really look like he is holding onto the sword and wall, he doesn't seem to put any effort to climb the building. the arms are a bit too straight. the placing of him seems to be a bit random. the sword doesn't really seem to do anything for the story or the composition of the wallpaper. Think a bit more about real life and how the human body would look in this situation, (if you are making a wallpaper with "your style" then make it look like everything has a meaning and fits in.) even a little bit of bending can do wonderful things to the pose, think and experiment with the placement of the character, think if some elements are really important and wont distract the viewer. Everything together: Try to work on character design, lighting, posing and composition, basically everything. The wallpaper is somewhat decent, but you can do better, now it is just up to you if you want to practice and do your best your works will improve, you just have to have passion for it. Things that could help you:

The font doesnt seem to fit. It's good, but could be better

First of all why caps? And PLEASE don't quote the whole post, the creator still gets notified about comments even if you don't quote the post. Also it looks nais. (and i dont know much bout rigs)

Ok so. Everything moves too fast, no one in real life could do that. Humans dont jump that high. Also everything ends too fast, he seems like a robot. Try making him more lifelike and not like a robot. Everything needs work, but im sure you can do it.

These two posts could help you:

When does it happen, like what do you do to cause it?

The pose is good, but you should add scenery and you could change the lamp of the light to some shade of blue.