The initial screen with the logo looks great to me. I like the way it has the logo big and the menu at the top, personally.
Scrolling down though...
I do like the black and yellow.
I think there is too much on the front page. I would move Staff, Testimonials, Values, Services, etc to other pages given the design choice of the big logo with clear menu at the top of the page.
I personally would keep the big logo, and reduce the first page to about 1/4 (or maybe 1/6) of its current length.
You have a mix of really nice photos and really low quality photos
Good use of "call to action" buttons
The styling on the main page feels kind of random, how each section has a different style. Its as though you were experimenting with different layouts to see what you like.
For me, #1 thing to improve is the very large, low quality photos. But I'm a photographer so I notice that sort of thing!