Great looking figure! I love the paintwork, that camo looks excellent!
I think however you may want to add one more small detail, the belt of ammo often had a starter tab attached to the end that feeds into the gun, this makes it much easier for the operator to quickly load the MG with gloves or under a lot of stress.
Here is one of the starter tabs:
I know it's a small detail but I'm sure someone with your skill can add this important piece easily! I think he may also have a very sore shoulder carrying the MG42 in that fashion, as it would probably be putting a lot of weight on the bullets that would be digging into his shoulder!