Login pop-up modernization and design work+ Login pop-up background (full screen) picture
(Idea for this: Small photos side by side size 300px-400px x 200px (photoframes) from known locations with text welcome to new york or Witamy w Polsce etc....)
or second option
make that login pop-up bigger and add there some background, without at all that white full screen background
Your proposal was:
-I think what you need here is only color change from white to dark, with more oppaciti - somethink like main menu bar. I'm talking about overlay of cours, not popup but it's fullscreen background. we could add some style to popup as well.
Ok, lets do this like you proposed, but i dont want any more dark into site, let's keep it light blonde and modern, pop-up background can be dark, i mean "full screen" background, but that is only dark what i want into site.
also you mentioned something about picture inside of login pop-up it can be something like welcome message with picture and logo example.
Social login will be also good.