Youtube Singers #1/#2

First Observation:
Well, my first thought is who am I to judge Cecelia Bartoli. I literally can't do one tenth of what she can vocally, so I'm a little intimidated writing this.
I digress.

While listening to Ms. Bartoli, Cecelia, if I might, sing 'Al tuo seo Fotunateo' (?) from Orfeo and Eurydice, by Haydn, I noticed:
- Cecelia has a very active mouth. She is forming her lips into shapes that might not be necessary to produce the kind of vowels and consonants she is trying to create.
- At times I notice her singing along and wam-oh! Her mouth flies open as though the sound is erupting from her, and I find it distracting... I know she needs more room in her mouth though, so...
-She sings with incredibly clean diction. Her lips are really active...
- She sings with an even vibrato and supported sound.
-Back to her mouth; Ms. Bartoli seems to tighten her jaw on the ascending and descending scales so that very little space is created..
-She has a very expressive face.
-If one can even notice this, I think her throat has an appropriate amount of face.. it seems relaxed?
-Re: what we were talking about in class along the lines of everything being in the same place head/chest wise.. I think it sounds pretty consistent.

I might be way off. "Samsonite... I was way off."

Second Observation...

Frederica von Stade singing 'Una voce poco fa' by Rossini...
Well, she is cute as a bug's ear. Let's start there.
Secondly, her singing is so smooth and even sounding all the way across the board.
She sings the melismatic passages with such ease.
Her mouth doesn't distract me.

I also listened and watched her sing 'Voi Che Sapete,' from Le Nozze di Figaro by Mozart and while I thoroughly enjoyed her singing on this piece, it sounded a bit that the lower register pitches were a little on the heavy side...

However, for the most part she maneuvers her instrument so effectively, singing on the breath at all times.. Beautiful.