can you manually make a google image sitemap?

I’ve been having issues with the image sitemap plugins. for some mysterious reason, I have 436 images submitted but only 30 are indexed. I tried all the most known image sitemap plugins out there but I don’t know how to trouble shoot that. more frustrating is that on google webmaster they don’t show you the images that are indexed so that you can derive some common characteristics. any assistance will be appreciated. thanks. souleye