I think it works very well and agree with previous feedback.
My suggestion would be to create navigation from one gallery into the other 3 without having to go via Photographs button on LH nav bar. I would also be trying to work out how I was going to expand the capability in terms of galleries and no of photos in each as you continue to make your excellent images.
I am currently struggling with both of these issues as I contemplate designing a new one for myself. Sorry, currently unable to offer solutions as they continue to elude me!