You need a cool photoblog THEME, more than plugins. Search this forum, and also themes.wordpress.net
It’s usually the theme style that makes it a photoblog. Usually it’s a theme where there is 1 post on the homepage, and the post consists of just 1 large photo. Then you can click Next Post / Previous Post, to get to more photos. Or you can check out photos sorted by category, or archives by date.
Some helpful plugins might be, Ultimate Tag Warrior to put descriptive tags on your photos (more detailed than categories)…. and I think there’s a cool plugin, maybe PostThumbs, that could help you create an archive page showing a bunch of thumbnails.