Default [HELP NEEDED] Coverart in a circle

Hello all !

I'm turning my head wrong with this question. I want to create a media widget on my lockscreen with zooper and MU. The question is simple, but I don't find the answer.
How to put coverart in a circle that I created ? (See the picture please)

Could someone give me the way to follow ?

Thanx in advance
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Samsung Galaxy Note II GT-N7100
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