When you say "he", does this imply you're having the site designed for you? People get a little touchy when it comes to defending their guy, or their own work, but if you're paying for that, the very first element of the banner image, and your brand, is not good work at all. The dithering around everything is the easiest thing to point out.
The first pic of the guy mowing, which I believe was originally a vendor pic, is used by a ton of sites.
I'd also recommend that you run the site through a code validator before any final payment. validator.w3.org
a guy who knows both the lawn business and web strategy