These questions have less than 18 characters in their titles, perhaps some of them need more descriptive title:
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When should I edit posts?
Any time you feel you can make the post better, and are inclined to do so. Editing is encouraged!
If you think a title can be improved, please do so, and remember to also fix all the problems in the post (spelling, grammar, punctuation, etc.) while you're at it.
What it wrong to have short or long titles? I think most of the cases, the size is acceptable.
On your list of short question, I would just add the question ("What", "How", "Why"), to make clear that it is a question. But sometime the question is really short.
I think we should also check the answers. If the answer is generic, it is good to have a generic question. Instead if the answers are not generic, the title should be corrected. This is often the case when it is not possible to answer generically, so we ask in comments about details (and questioner answer also in comment, instead of changing title or question details).
On the other hand, I tend not to like the very long title. I cannot quickly parse the question list, to see check the topic I'm interested in (either to read answers, or to write an answer).
IMHO, a description of the picture should be put into the question details (just to help search engines, so user with the same problem). The title could just have a very short description (e.g. region and the main characteristic).