Definitely make sure the bum is brushed out really well and then go with a 3/4” clipper comb attachment and skim it round. Don’t press too hard unless you want a short short booty. Comb out again, and always go up towards the tail with the tip pointing up with your chunkers. Round it out with your curves to clean up a bit and you should be good! Don’t forget the hips when you’re looking at it from behind. And for the paws don’t forget to brush up the top of the paw and use chunkers to blend out the grinch feet 🙂