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I guess it makes sense to have the images indexed, especially if in your context images could appear as search results. If not it won't hurt either. Google will be able to find your images through the links to your images when you use them in your blog posts. Add a keyword to the ALT of your image, i would also take care of the file name (same or another keyword?). I wouldn't use the same keyword in the title tag of the image again in order not to overdue it. You could even have the images added to your sitemap so Google would be able to find them for sure. But honestly if images usually don't appear as **search results **I wouldn't go so far. Hope this helps. Cheers, Cesare