Rate my art V2.0

Rate my art V2.0

I have a new set of images. They are not supposed to be on a single context. Anyway, this time I tried to make them simpler, maybe add some sunlight as well. The shield turned out to be kindof armor-like but meh.

The truth is that I have not found out a "good" way to practise ( I don't know how to practise? )

Next time I am probably going to post ~10 images on the same context , as well as some dull-level/demo (I can code but I don't think I am ready to animate YET).
I am also considering trying to do some background image, perhaps something like a city ontop of a mountain, with a pretty high resolution though.

Constructive critisism (or not, you can't hurt me :P ) and feedback appreciated and NEEDED.

Thanks for your time , here are the images: 

P.S. Can you tell iron-man's cannon and blade? 

Attachments: 
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beast0.png beast0.png 20.1 Kb [17 download(s)]
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robot-ironman-thingy.png robot-ironman-thingy.png 20.5 Kb [5 download(s)]
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goblin.png goblin.png 19.9 Kb [7 download(s)]
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rocket.png rocket.png 19.9 Kb [3 download(s)]
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shield.png shield.png 20.3 Kb [1 download(s)]