I now use a lot more shape without outlines, or I skip the pencil and go straight to drawing it, usually using something more unpredictable than a pen (eg. paintbrush, old dip-pen, or a stick). I've learnt to embrace the wonky mess that results. 
@katsuds Not sure how applicable it pertains to your situation, but your line work isn't terrible! And I had some thoughts for you.
Preface: For my work, I had/have to stop and slow down. Then methodically think about each press and release of the pen and sometimes that's going really slow. Like PAINFULLY slow.
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Proko had this segment about line quality that stuck with me, while penciling, your ghosting the stroke before it hits the canvas. Now obviously, you can't do that with inking, potentially, however you might try a small ink brush and practice just doing thick to thin lines or "ghost" the line before you touch the paper. Examine your current pace and then determine what pace makes the lines have the highest quality and appeal that you'd prefer. If that makes sense. This is also easier to practice like in Procreate where you make lines and undo it till it's satisfactory.
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It could just be the tool you're using and not necessarily you. Because the only issue I see, based off of what you pointed out, is the lines aren't variant. They're all the same weight. It appears they're all the same maximum press of the brush you're using. Almost like am Adobe Illustrator Stroke line.
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Maybe practice having lines smaller in thickness and then thicken the line in only specific areas and see how that looks? So that's a paradigm shift in your process of drawing, you know? Start with small lines, then "blop" in more thicker parts?
You can take these notes however way you like it. Hope it helps.