I think you did a fantastic job of catching the feel of that painting. You also did an impressive job on emulating his brushwork. Crit-wise, I'd say that the big differencea aren values versus edges. There are a bunch of interesting edges defined by the walkway/figure boundaries that one more sitting by you could take care of quite neatly. Also, a little more richness of color in the woman's dress and face--it's the only saturated color, so it needs to balance all of the grays out!
I like how you simplified the brick wall on the left.
Also, the "mistleote" (or whatever it is over the doorway!) is an important element to re-define in yours as its contrast and hard-focus is Sargent's crafty way of pulling your eye upwards and over, thereby subverting the (potentially very overwhelming and trite) "one-point perspective" trap.
Man I missed the start of this class! I'll see if I can do assignment 2, or maybe catch up with this one.
I just have some old Alkyds to paint with, but I've been avoiding them due to the fumes. And now that it's winter, opening the window is seriously frowned upon by the other occupants of my house.
But I wanted to respond to Philzero's question.
Lil question: whats the difference between zinc white and titanium white? In the end i went with titanium (because that's what they make space shuttles out of) which seems fine.
I've been reading about paint, and found this article on the Art Renewal Center's website, about zinc white. Apparently, zinc white shouldn't really be used, if you value the longevity of your paintings.