Hey dude, I looked through your gallery your already very good! But reading through the thread it seems like you want to improve proportions? I actually just started drawing again this month after not drawing for a while. And I found this awesome series on youtube that I think should help you and anyone out a lot. The person who teaches is very talented and very amusing. He goes through the atonomy and proportions of all the parts of people. [link] This is the link to it. It helped me out a lot and hope it helps you out a lot as well. Good luck and keep it, just keep practicing and drawing.
Look up andrew loomis and draw from life. Use photos of real people, objects and animals, stay the hell away from how to draw anime books, and you will improve. If you want to draw anime then fine, but learn proportions and anatomy first before you exaggerate anything.
Start drawing real people. Comics, animated characters, manga, and anime are simplified shortcuts that are made by people who have already studied and understand what the shortcuts represent (at least the good ones have).
You seem to be studying the shortcuts only, so you're not likely to progress further until you put the horse in front of the cart as it were.
Like they say, practice makes perfect. Your not gonna suddenly aquire great artistic abilities overnight. Art takes patience but it also requires that you enjoy what you do and be happy with your own abilities.
You should start out small and look at the small things that you wanna start drawing. Look at references, practice drawing them and master the little things before moving onto the big things.
Also, in regards to drawing manga, I could not recommend a better site than [link]. Its a really wonderful site that helps a lot. Youtube is a great resource as well as DeviantArt.
The best advice I can give to try different techniques and mediums, and to remind yourself that art is supposed to have mistakes one way or another. Artists learn how to improve throughout their whole life.
In what way do you want to improve? What kind of artist are you aiming to become? The stuff on your profile looks great as far as art of that genre is concerned. If you want to get better at realist drawing (still lifes, portrait, etc.) that's a different kind of art requiring a different kind of practice and training.
In that case all I can advise is practice, practice, practice. It definitely helps to get experience drawing a variety of things. I spent so much time drawing the human form - and have gotten proficient at it - that when I come to draw an animal it usually comes out looking cartoonish. Try working from life or from photographs. Basically practice how to draw what you see.This is quite useful for understanding how to translate real settings -how light works or reflects for instance - into a comic format.
What do you struggle with the most drawing people or scenes?
Geometric shapes, cylinders, cube, triagular prisims and rectagular prisms? These are pretty easy to find around the house, a childs ball is a sphere, a can of soup is a cylinder. Set them on a table with good lighting and draw and shade them if you have never done this. Everything is build of geometric shapes, so doing the basics gives you a better idea of how to do the more complex items, for example a finger is just a series of 3 joined cylinders.
If you have not done the basics, you probably have not done still lifes' flowers, fruit vegetables. They hold still while you draw them so that you can compare your final result to the original, and see where you went wrong.
You can do studies of fabric, throw lightweight fabric (such as a sheet) over a pile of stuff, so that it lumps, bumps and folds and draw that. Then throw a heavy thing of fabric (like a winter coat) over the same stuf and draw that. Make sure to notice how these things fold and curve differently, this will help with drawing people.
If you have not drawn from life do so. Draw yourself, your friends, people waiting at a bus stop, kids playing on a playground etc. Drawing from live people is going to be better for this kind of study than drawing from a photo refrence.
Surely not practicing or reading books about drawing. Also I would avoid watching other people's works and stay away from studying anatomy. This can really distort your skills. I just hope you don't end up on websites with fine arts, which could teach you how a professional drawing looks like and may god have mercy on your soul if you dare to try other techniques like charcoal or experiment in general. DO NOT PRACTICE DRAWING STILL LIFE OR MODELS.