>Choosing subjects for your microstock images is an important step. How could I have visibility among thousands of photographers ad millions of images?

You have a beautiful 'red rose' picture and you want to sell it in the microstock market... before try to see how many similar images are already in the stock agencies:

Dreamstime Search results: 26,823 images.

and then try the Rob Davis picniche.com tool for assessing the supply and demand of online stock photography images from microstock sites.
Here the likelihood of making a sale for a 'red rose' keyword phrase image:
PicNiche Rating (all): 0.93 (Rating < 10 is BAD)

If you have a stunning image maybe the chance of making a sale is higher, but generally it's better to find something else with more appeal...

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