Images are too large for me. My 20" monitors resolution is 1680x1050, and most of your images have a height of 954 pixels. My browser isn't cluttered with menu bars, but I can't quite fit your images into my browsers window, part of it gets cropped. It takes precision scrolling to line it up where I can see most of it, but that's not very user friendly.
I clicked on the Valley View from Mt. Hood T-Line, and the HD Download gave me a much taller view in full resolution. Your watermark is at the very bottom, and would be easy enough to clone out or just crop it out. I'm not saying this is a bad thing to do as I'm a fan of unobtrusive watermarks like the ones your use
, but it's somewhat at odds with trying to sell the digital version
.
I like how the main page is just photos, and you have more info after you click on the pictures (though nothing about the tulip one). The layout of this text in some of the more recent ones seems wonkily placed around your HD Download button though. Compare
Mt. Hood’s Hood. - Northwest in HD with an older one
Mother Nature Reaching Out - Northwest in HD, that has the text neatly below the download button.