This is a short list of things I've found helpful or interesting. Sure, right now, that list is two items, but I'll add to it as I think of things.
YouTube video illustrating MtF corrective surgery. It's all 3D models--no actual photos or footage--but probably still not particularly safe for work.
How to Develop a Female Voice. I found this more interesting than helpful. The steps aren't wrong, they just are easier said than done. Even still, simply pressing on my vocal cords with my fingers in order to reduce the resonance shows just how much a difference that resonance makes.
How hormones (HRT) change a trans woman's body. This is a pretty informative video on the effects of hormone replacement therapy, as presented by a trans woman (with adorable glasses).