Simplicity is good, when it's used well.
This set isn't close too good.
Simple isn't lines, it's an actual looking texture with some shading, some detail, but not cluttered with those lovely details like bits of whatever your set is based upon.
Yours looks like just a head with lines as all the other textures. It should probably be thought out a bit before making more 'details'.
Also, you shouldn't upload your images like that, it makes them harder to see and we don't see any detail at all.
Use gyazo and link the images to here. Or something else, that's the one that comes to mind.
I can't rate it really, from a simple point of view 4/10.