I have submitted loads of pics to shutterstock only having two accepted how

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i have joined shutterstock and uploaded about 200 pics (which took me forever) only two were excepted. I have a really good camera and took loads of my pets which i thought were gorgeous. What am i doing wrong and how do i get the clear pics that people on there have? My camera is a cannon and cost about £1,500 with the extra lens ect..