From my point of view the photo is not bad.
The colors are okay because they reflect the natural situation: the blue of the white part of the boat is absolutely normal as this part is in the shadow, the orange reflection on the sea is obviously the reflection of the sky, even if, yes, it could look a little strange.
The attention is drawn by the high light in the right, I agree.
I like the tonality of the clouds.
I think that this photo could have more chance to be accepted if you crop it a little the up part to remove the lighter part, and the right part to remove 40% of the high light.
Then the boat will be more centered, so more present.
Maybe you could increasing light and contrast on the boat will help a little.
www.nile7.com/content/%D8%AE%D8%AF%D9%85%D8%A7%D8%AA-%D8%A7%D9%84%D9%85%D9%82%D8%A7%D9%88%D9%84%D8%A7%D8%AA-%D9%88%D8%A7%D9%84%D8%A8%D9%86%D8%A7%D8%A1

OK, here's what I found:

on tab Tweaks
under Server Tweaks
Option Protect Files  must be unchecked. This caused derailing of registration

under Other Tweaks
(same tab)
Option Remove WordPress Login Error Messages, if checked, causes the empty pink box. That one at least is pretty obvious.

I have both options unchecked now and registration seems to work as intended.

However, some links in the password e-mail seem to wrong/misconfigured:

• The header "Welcome to..." links doesn't work. It points to \[url\]*
• The Login Page doesn't point to the login page but links to the license agreement page

Can that be customized somewhere in the SY theme?

No prob. The cookie prompt was covering your logo till I pushed "agreed"

Whats the hang-up people have with cookies and user notification? Is this a law somewhere?