your best bet is doing a side by side drawing of something, like have a picture and then draw it while looking back at it and when you start doing well at that try covering it up and doing it again and again without the visual and only your memory, same goes with proportions it's good to start like that but it also help to draw the skeleton only and leave out the rest so you get used to it before you start adding a body since that helps with posing and positioning your character better, but also depends on your style of art you plan to do as well.
there are tutorials and such on DeviantArt/Google and they kind of work the same way is the Side by side method and but require you to follow steps which might be easier to follow for beginners, but your best bet is drawing stuff that you can look at before you get into drawing stuff from your head at least that's what i've been told many times and have done myself.
This post was edited by Dragonox on Feb 14 2012 01:45pm