Does the state your hunting define it as buck/doe (male/female) or antlerless/antlered? Most of the states I've hunted goats in define what is a "buck" by being some minimum length of horn...

I'd say your correct in your assessment of the bucks vs. does on your picture. I'd also tell you that while hunting goats you don't have time to be sure of what your shooting at, it's probably not a shot you should take. I think you'll be fine in being able to identify buck or doe.

Where are you hunting at? I leave this Friday morning with my son to hunt them here in my home state of SD.

Good luck!

P.S. Do your best to drop them with the first shot, they can get pretty gamey if they run before they die, the adrenalin gets into the system and can make for some nasty antelope, second, skin them ASAP, and cool them down. I actually skin them in the field. I rigged up a deal on my truck hitch to skin them on the spot.