I give green flags to everyone, & suggestions (if any) after flagging it green. Till now, I never gave even a single red flag & I won't give in future too.
The reason why I give green flags to all, is because each & every person puts some or the other effort while creating an img train.
However, I might miss / overlook some of the created img trains. Hence, those creations might not receive flags from my side.
So,...
more... it is better to tag me, so that it comes to my notice.