Unfortunately visual examples of a "size" based on ccs or volume doesn't give a realistic look at what they would look like. There are other factors to consider. The girl's height, frame, measurements, muscularity, body fat percentage, etc. All of these can produce a different outcome of what 450ccs would look like. Even the implant type, saline or silicone can both have different looks with the same 450cc volume. Saline could be a 300cc shell overfilled to 450 in a high profile shell for example, which would differ from a 450cc saline shell or even a 450cc silicone shell too. A person would need to your friend's information to find a girl with a similar body type to give a good example.
780ccs overfilled saline shells on my ex looked more like 450-500ccs because she was 5'11" and wasn't super thin.