It looks really cool, but the cloudy part nearer to the chief should be the same colour all the way around. It looks unusual having the lighter brown on one side of him and then having the darker brown on the other side. I like how it fades out to the darkest part though. I actually really like the brown colour choice overall.
Do something ELSE. Try to make a sig that doesn't use smudging as a main part of it. All of your more recent sigs are bland (save the Yakuza one), because the smudging is boring, monotone, and there's nothing else to it! But I understand that this is your first CS3 work.