Can I get help please for why these photos have been rejected for technical issues

Hi All, 

I have only recently signed up with Adobe Stock and am confused about the Technical Issues rejection statement.

I would love some feedback please as to why some of my images have been rejected due to "Technical Issues" which will hopefully help me to decide on future photos I submit.

I have attached 4 photos here for thoughts and comments. 

Thank you for your time.

Connie