I love all of these, there's nothing I would work on for these sigs. Except maybe lighting. Great job, you should enter one of these into SOTW. Well keep up the great work.
Your sephy one is hawt. The flow is great on it. The colors look really nice. And text is very original imo. Omg...I just realized. Your c4e... where have I heard that.... OH. Final Prestige, I've seen your sotw entry on the voting thread dude, nicee. ;D
I definatly love the one you use now (Cloud?) - red and green elements has always been a great combination for especially signatures I think, they oppose eachother in a harmonic way. The parts connecting him with the background is a real nice touch, it is my favourite part about the sig.