Tudore,
Proportion issues usually arise by spending too much time on one section at a time. It's best to get things down and visually by going back and forth over the figure evenly.
First lay down your landmarks without putting ANY detail down. Once you feel the proportions feel like the model or are how you want them, then go in and start putting in your structure and so on. It's good to have a "shorthand" of how you rough in your character so you can get things down quickly without thinking too much. I have a little tutorial that may help a bit over at http://drawniversity.blogspot.com/p/sample-lessons.html. Take a look at the pages toward the bottom.
I looked at some of your more recent drawings. Pixelovely Human 40 shows you have a good eye. Just get your form and structure in before you put down your detail.
I hope that helps!
--Josh
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