Select the layer again. Select All command.



Now choose the round marquee tool and holding the shift key select here.

It will leave only what you haven's selected.







A little transform and further this one too.







And use the same white to transparency gradient.

Be patient! Any illustration is built form small pieces.



Now you remember that we had 2 copies of the layer. Forget it :)!

1 - Fill the Background with pure black.
2 - Turn one of the copies off visible.
3 - Erase the layer.