comscar said:
Can you elaborate a bit with the human anatomy? I don't fully see what exactly i screwed up on (except for the Mad Max drawing, and the annorexic raider. those do look like garbage).
Contrary to what the others here say, I like the "Standing in the remains of a street" drawing best of all. The way you portray your character in that drawing, well, that actually works IMO.
Knowledge of the human anatomy will undoubtedly aid you in drawing more realistic, 3D characters, but as Dopemine Cleric pointed out: some artists do actually use your more flat, anatomically incorrect types of designs and effects for a purpose in their drawings, so it's up to you to figure out just how correct you want to depict humans in your art.
Best thing you can do is construct some sort of simple wireframe for your characters, something like patriot showed, but mayhaps less square 'cause that's his style, not yours. Then you drape the skin and clothing over that wireframe.
Another thing you should spend more time on is perspective. You already seem to understand the basics of it, but - for instance - in the "Standing in the remains of a street picture" you still make some detailed mistakes that throw the perspective completely off balance:
Perspective doesn't need to be 100% right to be convincing, crooked lines often get you better, more lively results than geometrically correct constructions, but you can NEVER be inconsistent. You are obviously constructing some of your scenery along the wrong set of lines, thus mixing perspective with something like an isometric projection method (the top lines of the door and traffic sign for instance). In short: if you draw a horizon, you need to respect it. Mistakes above the horizon catch the eye of the beholder real quickly.
Anatomy and perspective aren't hard to learn at all. I don't know about the bookshops in your country, but over here one can find simple and deadcheap books about these, specifically aimed at beginners. The nice thing about drawing is that the basics of it are actually really limited in scope (the knowledge needed to construct a picture), yet the possibilities they open are pretty much limitless.
Cheapest, most fulfilling hobby, if you ask me.
On a sidenote: you might also want to look into the concept of drawing on the right side of the brain, Betty Edwards theory of how to look at reality in a different way (well, different for most, I guess). You don't have to delve into it, just understanding the basics of it will help you a long long way. Iit's a mental change if anything else really, some do it with the blink of an eye, but others have to train at it. You obviously use your left brain way too much. That's why your drawings are so grey and sans contrast (your left brain kicks in and tells you how subtile the colours and shadows are, and it's right, but that won't help you one bit while you're drawing), that's why you make those stupid little mistakes in your perspective grid (you think about it too much, you should just see the grid in your mind's eye, like a HUD that filetrs reality before your brain gets to it) and so on.
