If the maxilla is pulled more forward and upward, what changes to the face/facial features would happen?

There will be definitive changes to the face and thosewill vary with your anatomy and the specific typeof maxillary surgery performed. Your surgeon is thebest person to discuss those changes with you. Be sureyou understand the risks and options of treatment for you.

Dear JudyPiretti,
The greater changes are widening of the base of nose. The tip may become slightly elevated but not by much. The eyes will not change but the face and jaw will become shorter and rounder.

Hi Judy,
This is a good question, and an important set of concepts to understand before undergoing this type of surgery. 
Unfortunately, the changes in your facial features depend on the exact type of surgery that you are undergoing, as all maxillary advancements are not the same (differences in the amount of movement planned, where the bones are cut, etc). Because this can/will vary a bit from surgeon to surgeon, it would be best to ask your chosen surgeon how the planned surgery will effect the rest of your facial features. 
You should be informed about all of the anticipated changes that will occur. Both you and your surgeon will be better off if you are well informed prior to surgery, so please don't hesitate to ask!!
Hope this helps!
dr. silver