Who made number 2?
Number 1, nice drawing, maybe. Probably took quite a long time, but I don't like how it looks.
Number 3, don't really get what it is, but it looks cool.
Number 6, nice detail on the eye, maybe add more to the skin?
Number 8. I like the vector style, stripes, and background. Not a fan of the murky green in the colour scheme though. It gets my vote anyway.