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Some of your works are quite good. I like your self-portrait, for example. But, nevertheless I believe you should work some more on those proportions. When you practice proportions, don't hesitate to use some kind of measuring device in order to find out where you went wrong. When you get a wrong proportion, redo it. Either rub out what is wrong or redo the whole thing, until you get it right. When you can do the proportions, get on to the contrasts and practice depth.
Perhaps it would be a good idea to stop painting until you get the proportions and the contrasts right. You might occasionally make a nice painting, but the problem with the proportions and the contrast will keep reappearing.
What is your goal anyway? Are you 'just doing this for fun'? or do you want to become a fine/concept artist?
Don't loose courage! Keep working!