You need to describe the pic, like where it was taken and picture quality also matters make sure it is off good pixels.
give some description about the place where you took the pics, in this way you can earn credits because it has be approved by this site and they approve only when they verify with details provided by posters , I hope this will help you
You get credit for uploading photo blog. I got 75 credit for one of my photo blog. But photos have to be of very good quality and you need to write some description about the pics so that it is a value add to the reader. you won't get any credit for just uploading the pics
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Earn credits when your answers are upvoted by others.