Be cool in Stock photography !
Stock photography in the world is known as imagery of concepts, events, things, etc. that are intended for commercial usage, publishers, advertising, web designers, corporations -such as banks- and many other entities to fulfill their creative assignments.
Usually stock photography is no lesser than any other form of photography, in the world the demand for a great looking, high quality photography is the rule of the business, stock photo agencies have very high standards they will check images before accepting them and they will be pretty harsh sometimes, but nevertheless a stock photographer should do the best effort to offer the best quality around; stock photography sites want: photos without blur due to camera shake, noise free photos, photos focused on the subject, photos without any heavy manipulation.
DA is a place where stock photography newcomers can hone their skills and practice as much as needed, this said there are some tips that might help you get the best of