NNNNNNOOOOOOO!!!
For pity's sake - just get out your camera!!!
Its better for the look of your site, sells your services better & sets you apart from those who re-use the same stock photo's over & over.
Stock photo's rarely look good on a sole traders website, the only window cleaner I know who used stock photo's & made it look good is John Nolan,.. but he's running a far bigger business than most of us!
JD has done a brill job with his photo's here - showing his face, him on the glass, his van etc, the customer subconsciously feels more comfortable phoning someone when they know what you look like, so it really is worth the effort:
http://www.jdwindowcleaningservices.co.uk/