Point blank, you need anatomy practice. It's cool that you're designing weapons and what not for a story, and the weapons look okay.
But what's going to happen is you're going to have pages and pages of weapons and when it comes time to draw people using them, you're going to have bad results.
Not to over-analyze this, but this drawing says a lot about where you're at as an artist. You're doing a lot to compensate for what (I think) you're not comfortable with. Baggy clothing, baggy pants, and faceless. Everything to avoid the need for convincing anatomy.
You're continuing to draw monsters and creatures and weapons. I'm not discouraging that. By all means draw what you like. BUT you NEED to draw what you're uncomfortable with too. And post the results. You might get people mocking it or insulting it, but that's okay because it doesn't matter. Just keep trying.
Right now you're avoiding.