This Cabinet is $155 at Ikea. You could take the 4 items you had hung, and put them in a "shadow box", or individual deep frames to tie then together, to create I piece that looks more substantial on the wall, Then add a little ledge for photos, and you would even have room on the cabinet for the cool bottles that were on the floor, and that cool chest could definitely find a home as an end table, or entry table. You could also add a larger plant in a really nice pot in turquoise. The cut and paste renditions arent always completely accurate in scale.

Since we are only able to see a small portion of the entrance the only suggestion I have is to paint the wall. The creepers might be a nice addition but I think paint would really make the wall and your plaques stand out.

A Cuckoo clock!!! We have had a cuckoo clock back home forever with really great travel memories.

Ka_kamakshy interior architect , Did you check with your contractor why he thinks it will fall down. May be he hasn't done it earlier or he doesnt want to do it. It is very much feasible to clad the walls with marble/granite/ other finishes.