well, the title is helpful, but really you need to think about how YOU want a search engine to work for you as a searcher, and you can bet that's how the folks at google address the issue.
when you search for "elephants" are you more likely to be interested in 10,000 pages saying stuff like:
- elephants are great
- wow, that looks like elephants
- elephants have wrinkles
- these are my elephants
or are you more likely to be interested in pages with lots of interesting content about elephants?
given that the google software can't actually "look" at the image (yet) the priority for images is very similar to that of text pages. The more relevant content there is, the more likely that pictures on that page are targeted to the search terms.
After all, you want pictures of elephants right? - you don't really want throwaway lines like "my ex girlfriend is an elephant" to rank particularly highly.
The people who make search engines have to struggle against webmasters who would force their way into the top results - really, we all want to be there, but the only reliable way of making it happen is to have *lots* of *quality* content about a focused subject.
You have a thousand images with barely any information attached to them, and the vast majority of which have no relationship to each other.
Only the artist and existing fans of the artist are likely to consider that a worthwhile hit in an image search.
As for your title tags... this image here is called '5' - seriously, are you pulling my leg? This is you trying to get indexed?
"human series 2"
you've got to be freaking kidding. What exactly should I be searching for to find these things?
If I searched for teardrop, I'd honestly be quite disappointed if I found that. Not because it sucks, but because it's general usefulness as an image is extremely low. It's nice to look at, but what can I do with it?
Making your site work with search engines isn't very complex. You just have to put yourself in the shoes of the average consumer of search results, and ask yourself "if I wanted to find this, how would I look for it?"
For you, the answer is to include the words art, artistic, painting, etc on literally every page. Perhaps if I searched for "artistic representation of a teardrop" I might be more interested in that result -- particularly if it came with a description of the artist's vision when creating it.