Here's a pic of La Source. I think 40502 is Raymonda Variations, but I couldn't find a photo of corps costume for comparison.
40502 - La Source
40505 - maybe Davidsbunlertanze?
and many of Serenade, of course, pictures from different eras.....including 04, which is in front of the theater formerly known as the State Theater.
40505 looks to me like a Midsummer fairy from Titania's retinue.
40504 is definitely not outside the DHK/NYS Theater. It looks like a church to me. The facade of the theater is flatter -- less relief -- and several shades lighter. Also check the pavement -- definitely not part of the Lincoln Center campus, in any stage of the renovation (so far, at least). There are no risered steps so close to the building. Also, I don't think it's Serenade. Dancer's skirt looks too short and too full.