1/2 GSD 1/2 Bernese looks right..your dog looks EXACTLY like mine did as a pup, and he is for certain 1/2 GSD and 1/2 Berner...(I knew his parents).
People always think my dog is half rottie b/c of the eyebrows (and other features), but he is not.
My dog's ears do not stand up like a Shepherd's at all, but they do have a bit more 'lift' to them than being totally floppy. Also, my dog has one ear that stands up much more than the other, which is adorable.
You are lucky. This is the best mix I could ever imagine, and yours will be a great dog. Watch out for grain allergies, however.