your avatar looks like he's committed one murder already and he's contemplating the second, watching his possible victim walk by, memorising their daily pattern so to catch them alone in the dark to do the deed. but he could also be going, "damn girl, walk over this way, mmhmm." (nope, no idea what i'm talking about, this is why i'm single.) whereas the other icon is more obvious, more likely to get caught, possibly about to kill and overjoyed by the idea but could leave a messy behind.