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There is stock & then there is stock! The high end agencies such as Getty have a very different market than istock who sell images for pennies.
The iStock ones end up on web pages, or companyflyers where generic images are required, many people believe that they have a particular look to them (as do Getty, far too perfect!)
The more expensive agencies sell into newspapers magazines and books, with an element of advertising because they can buy exclusivity.
All of the agencies have stringent QC policies and images such as macro wildlife and stitched panoramics are notoriously difficult to get technically correct, many believe that it is in fact impossible for a macro image to pass QC because of the way Macro lenses work. Long Telephoto is difficult because of several reasons, one being atmospheric distortion if you're at a distance.
Then there's another problem, excessive similars. If all you are shotting is easy common wildlife then the world & his wife will have already done the same, you will either have to shoot something rare or difficult, or else find a novel take on the familiar.
Before you do make any decision take a look at the QC criteria for stock libraries such as iStock or Alamy and see if your images meet them, then submit some for QC and see if they pass, if nothing else it will make you a better photographer!
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