Appraiser using wrong comps?

[Hannah Joy]

Hi there, I just had an appraisal inspection done for a cash out refi. Subject property is a duplex: 1 side is 5 bed 2 bath, other side is 2 bed 1 bath. 3000 sf total. Comps will be difficult, and he'll be looking at the recently sold houses. He mentioned driving by and taking photos of comps. Most comps I'm seeing are not updated, from the Zillow ads, and ours is fully renovated. If his appraisal comes back low, can I challenge the comps? How do I go about that?