To be honest I think your drawing is pretty good, you've created a style that you are used to.
So just looking at the pictures you have provided I think it fits the character since I am going off of the looks not the personality, if there was also the personality of the characters than I would say somethin different, it depends.
You shouldn't put yourself onto a low level as what you are doing, it creates things to your mind that are negative toward your artistic skills and such , I have experience somethin like that before that I just wanted to give up on drawing just because it doesn't look as what I was going for.
I don't know, I think there should be a balance of that you know on where you have both a positive and a negative but that is just me
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I really don't know what to say about this one, I guess all I could say is look at the peoples recommendations they have provided here on this thread, because they are all good 
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I really think if you feel like you have to follow this strict and malfunctioning structure you should break away from that but then again you've said you are clueless without it so that's where it gets hard, I could say that maybe you should seek out different types of artist who have gone thru something similar or how certain artist begin their work, but idk.
Sorry that I wasn't much help with your problem that you are having 