Adobe Bridge is the best way to automatically create a series of images for preview that are labeled and watermarked. To do this, start by putting all of your images into a folder. In this instance, I have created a folder called inkart vector art pdfs. The logic is this - Bridge considers the folder with your original artwork (or photography) to be the content. So the window that you are seeing below is what is inside of your folder. To select images inside the folder, click on them. To select them all, click on one, and then do a select all.
Another thing to select is filename, which is under Overlays. Why overlays? I don't know, there must be some logic somewhere! But again, it's worth fighting with this program, because it will put the filename under each image. Deselect extension, and it will take away the .jpeg or .tiff or .pdf. This gives a beautiful little label to every image. Be sure to write out the file name normally, with spaces, as it will be the caption that your client will read.