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The game is planned to be a sidescrolling beatemup game with randomly generated, hopefully infinite/large map areas, quests and lots of loot. Currently gameplay is in a very basic groundwork stage with nothing really to show. I need some advice on artistic direction and layout, so naturally I came here for advice!
I'm not a very experienced artist, but I will gladly take as much criticism as I can get.

This is the latest mockup, mostly focusing on technical aspects of the layout and clean sprites for our programmer.
http://imgur.com/TMMJBq5,qZJynhM,OeP4JXl,q9aeUOf#0 old mockups with scrapped ideas
On the left of this image is a more cleanly pixeled knight character, left is a trash knight in a quicker, less neat style. I want to be able to make lots and lots of sets of armor without doing a shitload of animation for each and every one, so I plan on having a few basic upper body poses and a running anim. I also might put in rudimentary arms so it doesn't look so stupid, but I also want to have tons of weapon shape/size variety without having to animate a whole bunch of sets of weapon stances. Obviously I'll have to strap down and do the work if having no arms looks too lazy.
Other concerns are how nice the UI looks, seems pretty bland to me right now and composition help would be appreciated.
tl;dr:
i'm a baby who can't make any major decisions on my own. help please