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I think a scratchy/messy style is okay, provided it fits the tone of the story. My concern with your linework is that sometimes it feels like the lines are randomly placed instead of having a specific purpose.
Here's a couple of rough sketches from Larry Hama:
Nothing feels randomly placed to me in Hama's artwork. Every line is building form and adding detail. I'd say this advice applies more to your barbarian pages than it does the beard pages.
Another suggestion I have is in regards to the first page you posted. I had a difficult time deciphering what was going on from panel to panel. I would make the silhouette of the chimp stand out more.
I'd also just work on your continuity in general. It's difficult to follow where things are going on in the environment from panel to panel.