Thanks so much for answering my question! I'm sorry one more please (sorry I'm being a bother), when does a model's shoe size become a problem? When she exceeds a size 9, 10, or 11?
The thing about being tall is that usually the shoe size is big as well. While this may be inconvenient, it isn't so detrimental to the point where it would really negatively affect your modeling career. Almost all tall models have larger feet, so this is something that agencies and clients are already accustomed to dealing with. But if you happen to have an out of the ordinary shoe size, this is something you would talk about to your agent. If you are searching for an agency, then don't bring so much attention to it. List your shoe size honestly and leave it up to the agency to decide whether it's something that can be worked around or not. There are many agencies out there so chances are you'll find at least one that won't mind your big feet.
Just know that when it comes to fashion shows and other type of events, models are often asked to wear shoes that are too small and you've gotta grin and bear it...so be prepared for that!