its navi, and 5 different greys on the blade ?, i only used three 
You've got a stray pixels above the shield.
Two of your midtone blues (#7981db and #8389de, not sure how else to specify which ones I mean) are almost indistinguishable. You have some dithering going on between them but I don't think it makes any difference.
Your five different greys on the blade of the sword make it look overly soft, it reads more like a cylinder than a blade. I'd trim it down to just 3 colours to make the whole thing read as something with sharp edges and transitions.
thanks budday