cool

I imagine this is what playing a Grateful Dead song in Guitar Hero would look like.

The design is strong, but you have some issues with AA and banding. In particular, the green and yellow strips, the white outlines emanating from the skull, and the eyes of the skull could all use some touch-ups.

 Great job! :)

Yes it is o/ 

Is it better like this?

I also think that something feels a bit wrong with the yellow and green strips. Maybe you could try verticals for these 2 inner lines? 

Apart from that, very good job ^^

 I did another version, but it doesnt upload.

I think the inside edges of the green and yellow things coming foreward can be AAed better.  Personally I feel that the skull looks more radioactive than phycodelic, but it looks cool none the less.