From what I've seen, it's not always a pattern, but MTF's who have not taken hormones tend to be mistaken as much older females or obvious crossdressers, while hormones in MTF's seems to take decades off their appearances and truly tends to soften things up. Then with FTM's, it seems that pre-hormonal FTM's seem to be seen as very young teenage boys or just "butch", and then after hormones, most do not seem to truly look older than their natural age (if so, it seems to be slight) but they truly seem achieve a male image very starkly.
I guess the real pattern is that some folks truly transition at remarkable physical rates and features, while some folks just don't transition well and may need facial or body surgery instead (or, extreme case scenario, may be better off 'choosing' an alternative identity.)