i need to know the name of this effect? could anyone help?

This is a font forum You're obviously in the wrong place.

Apart from that, look at the contours around the shirt and hand. Nothing but a cut and paste job. Nah ... job?

Stiff little finger !!! It's the Invader effect !!!

(private joke for those looking TV in 70's )

lower left corner : halftone pattern
lower right corner / top left corner : light flare
background : color gradient

photo : crappy cut and paste job, as KK said