I cannot give a high enough recommendation for Marie Simmons' Fresh & Fast Vegetarian. She doesn't have photos of all her recipes, but she has a lot, and the recipes are extraordinarily good. I have a lot of veggie cookbooks -- including almost the entire Moosewood corpus -- but this is far and away the best one I've used.
For a photo-for-every-recipe, you can't beat the giant Best-Ever Vegetarian Cookbook, but a lot of the recipes are really fussy to make and they often require some tweaking to come out right. Basically good stuff, though, and really good, step-by-step illustrated instructions for the more complicated elements.
I have a couple of other photo-for-every-recipe books, too: one's just called Vegetarian,by Fiona Biggs, and it's pretty good, lots of variety anyway. The other is The Essential Vegetarian Cookbook, by Bay Books. Don't have much experience with that one.
I'd recommend checking out the bargain-book displays at your local big-box bookseller, too; there's often a lot of cookbooks on the bargain shelves for (usually) no more than $5-15 apiece, so it's worth the risk of grabbing one you've never heard of. These big bargain-oriented cookbooks tend to be heavier on the photos than other kinds of cookbooks, so you might find something more like what you need.
Oh! One more idea. If you subscribe to a magazine like Vegetarian Times, they often have loads of illustrations for their recipes. Also, since they're magazines, you're likely to see more seasonally-oriented recipes, which is great for using good fresh produce, etc.