This isn't a full guide and everyone has different ways of drawing, this is how i tend to construct images using 3D shapes and guidelines - practice will make perfect.

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Just a few tips:

*Don't give up if you dont like it, leave it for ten minutes and then go back to it. It helps you see where you have gone wrong. This is not the same as starting again, if your picture is beyond repair do not be afraid of starting again it will be better second time round

*Always, always credit any photos you use as reference <--- Never trace the photos. It will not help you improve and can amount to art theft, photos have the same protection and it is the same as drawing over someone elses picture.

Large version: http://fav.me/d35efpv