I was bored and decided to make Organization 13 sigs. If you want one, tell me and I'll give you the url.
Nice sigs. All are pretty simply done. I recommend you to put borders to sigs and something extra like you did in Demyx sig. I would say these are worth of 8-
Very simple, it looks like you just used a filter over stock photos. Try using a render, a stock photo can be difficult to manipulate. Also, the brushing in some of it looks random, try some blending style instead of just using filters.
