Hi All

I am very new with stock photography. Still need to learn more.
My main subjects are travel photography

I just received some rejections from canstockphoto.

Please give me some feedback, so I will know what to do.

File shows too much noise (a.k.a grain):
https://www.dropbox.com/s/90z52yw9ifoi22z/kemnade2.jpg?dl=0
https://www.dropbox.com/s/1kn2jablpct1ytf/lourdes2.jpg?dl=0


File appears to be underexposed. Please consider re-shooting or
editing the file accordingly:
https://www.dropbox.com/s/munvhqwmpjccr5d/angkuh.jpg?dl=0
https://www.dropbox.com/s/v4swo83575rr655/Karlsruhe%20Palace%20Germany.jpg?dl=0
https://www.dropbox.com/s/63qldcpkq67qbwz/Ta%20Prohm%20Angkor.jpg?dl=0

 File appears to be too soft and/or out of focus, or may have an overly
shallow depth of field:
https://www.dropbox.com/s/2f2k2k225bvefw7/grotto2.jpg?dl=0

Thank you guys