These were absolutely adorable to look at, and I just had a few quick comments. First, I think you've absolutely mastered the art of caricatures. Have you done any before these? If so, I'd like to see them!
Two things about Rob; first, why do you have two of the same picture? At first glance, they look exactly the same; Is this somewhat of a 'guess what's different' thing? I'm willing to bet it was just an error; be careful of that in future . Second, his hair color is off; it's not black but more of a dark-reddish brown.
Otherwise I loved every last bit of it. If you do more caricatures, will you be taking requests? ^^ Good luck, and PM me if you need anything.
-Elinor x
All our dreams can come true — if we have the courage to pursue them. -- Walt Disney
I don't have much of a knowledge on them, so I'll just point out a couple of things I noticed. If you believe I'm wrong, please ignore me.
For all the colouring could be done a lot more smoothly. Their faces are white and pink/yellow shadows. Applying different pressures of the pink/yellow to create a bit of dimensions will really bring these things to life. Same thing with the hair, you want more layers of colours to make it pop. It looks like there are two or three pressures of black/grey. Picking a light source would be in your best interest. Depending on that light source, you can decide which strands would be shiny and which would be more in the dark others in between.
But otherwise these are really great!
All the best,
Kamas
"Nothing is permanent in this wicked world - not even our troubles." ~ Charles Chaplin