Put in another 15 minutes - keeping it loose and fun. I have been using a cheap acrylic "white" which is great for body color/mixing/lightening but is not really opaque. Today I used a bit of true titanium white. I'm using a flash for the photos which is a no-no but oh well at this point.
The sky should be darker but I hit upon a winter sky color I have been searching for -- this shade is used often by my favorite painter, Childe Hassam (1859-1935) in his winter street scenes- if he had lived to 100 years I could have met him. I have left a border top and bottom but will probably fill those in. The cab drivers will be painted next.