You could always to a google image search for angels....
On the main google page click the tab "images"
My friendly local printer uses them all the time, he says that as they are all "public domain" images there is no copyright issue
Remember to keep your logo KISS = Keep It Simple & Straightforward
A black and white line drawing is much cheaper to print than full colour, and might even be more noticeable than a photo
I would try the words
ALI'S
ANGELS
[/b]
with just a wing either side, or maybe a halo above........
Remember your logo needs to look good 15mm x 15mm on your letterhead, 10mm x 10mm on your business card, and 600mm x 600mm on the side of your van!