Why my design got rejected

logos

#1

Please look at my files and tell me what is wrong that it’s just been rejected.

I used this image as a thumbnail which I approve it’s not propper but I couldn’t make it better, Do you have any Idea to make it better!?
colorfulBird-thumbnail

I used below image as a preview image which I didn’t use any mockup.
colorfulBird-preview

and also the main design is used in blend modes that it is blended with the background that’s why I used a white background for it. I am not sure I am allowed to …!?

fist I’d love to know my issues then try more, I’d be happy to know your opinions.


#2

that’s your problem, right there, logo must be good on any background not just white, avoid blending with background