Look closly to see how I shade it, try shading the same way with 7% octipusy... and shade everything, that icon is 2.5/5 from me now sry. (I am talking about the helment you made) (No offese please)
This is not some kinda imba icon you shouold stick with but it may help you, you can also watch a tutorial how one guy made a slash icon (Search it in icons) and se how he shades, that tutorial helped me start making better icons...