To gmanthesandwhichking:
You show that you have a good eye for form, if you haven't just traced these. The ratchet is nicely shaded also. It would be nice to see something you've drawn from your head or from real life though. It might be fun to redraw your favourite characters and other imagery, but you wont learn that much from it. If you want to improve you should draw something of your own. :)
Keep at it.
laserkarl your a moron, its evident that he has no idea how to shade or any idea how to apply values, and your improvement advice is also absolutely retarded, how the hell is he suppose to learn anything if he "draws from his head". Clearly your not speaking from experience.
DONT draw from your "head" draw from life whether its a sock laying on the floor or a interesting figure on a table. Learn your values and learn to reach the appropriate shades needed. First you need to work with your values and line control, put your rachet and clank stuff away and start pumping out studies and not spewing out trash.
Sorry for being a dick but laserkarl is a retard.