Move the verts to match the ears rotation and shape you have been given in side view, and you will eliminate a lot of trial and error.

For the front view it'll be more of that indeed unless we can find some good ref's. You can make sort of an educated guess by looking at lots of badger photos from all kinds of angles to help describe how much it sticks out and what kind of rotations.

Be brave and expect some trial and error. Ears is the hardest things to model on a human, but the end result is worth the efforts. I think it will be even more pleasing as the ears will give your badger a lot of character (personality and body language etc).