You have got a very sweet style going on, a few touch ups on the sigs, and your work will be pure gold! =)
Your good at blending and colours. Blending is mostly top notch, so is the colours, but give complementary colours a go. ;)
My faves that really caught my eye:
Sure, there are things you could improve, BUT your sigs overall are great, and might I add, one of the best i've seen here so far. ^-^
Keep it up, your def on the right track. =D