Guest Room - stick a pin in the wall map to show where you've come from. The travel theme is continued with the stacked vintage suitcases at the foot of the bed. An old steamer trunk would work as well
Grey bedroom - could add a splash of color to bring it up-to-date! Really nice idea and love the colour scheme, but could maybe soften the grey a little so it's not so harsh. Love the white bedding and black-framed photos.