It's amazing, really. But there are a few realism flaws
-The adams apple sticks out a bit to much
-The arms that are connected are a bit short
-Italy's jaw bone is a bit to dark, It looks like his skin is pulled very, very tightly over his skeleton
-They have very small hands.
-The arms that are connected are a bit too close to the head.
-Germany's note is a tad bit small.
I really don't know if you were aiming for realism but that's all I could really pick out. It's really good though, I didn't know you were capable of this kind of art.