A recommendation to help you get the most of your pixel art practice - focus on your pixel art techniques instead of agonizing over a menu layout for a fictitious game.
When you're done with this project what'll matter is how much your pixeling improved; this inventory screen won't get used.
Been pixelin' a while, it was a weird mind switch I had to kind of do to understand graphics on the pixel level. Took me a while. So I get it.
Following up on my previous bit about noisy pixeling, here's an edit -
be sure to click to zoom inThis applies to pretty much your whole thing, but focusing only on just your arrow element, I feel it's trying to do too much, too much detail leading you to create noisy non-descript texturing, and the AA borders on blur.
I gave it a shot real quick; tried to fix the overdone inconsistent AA, tossed on a highlight so the shape pops and implies a gold material.