Hmm... I notice that the items' sprites are in 16x16 pixels. Unfortunately, it is very hard to fit much detail into that little space. I think that 32x32 would be a much better size. I happen to be experienced in making equipment in 32x32, so I can show you how much more detail can fit in.

Here, for instance, is a glatius I just whipped up quick. Nothing too impressive, but it demonstrates the principle.