DS1 looked exactly like my DH as a baby until he was 4 months old, then he started to look a bit like both of us. He's 3 now and people are finally saying he looks more like me.
DS2 was a VBAC so we were lucky enough to have a 3D ultrasound at 34 weeks. DH was very chuffed that it was another bub that looked just like him (and at 13 months still does). Isn't it funny how it's so important to our blokes that their babies look like them? There's no disputing that we birthed our babies but I guess our men have no proof that they're the father.

On the skin thing, DS1 is a pale skin like me and DS2 has his Daddy's slightly less pale skin. Honestly, it's a roll of the dice what your baby inherits from you and MIL's will always be biased towards their offspring and genes. My DS2 looked like he was going to have red hair for a bit and my Mum kept saying it was from her Dad, but she conveniently forgets that her ex-husband and my Father is a redhead!

Don't stress about it, it's exciting waiting to meet your baby and see what they look like for the first time