Ship Mosaic Progress

I've been working on the sky area of the mosaic. This photo isn't the best - it's hard to get high enough above the mosaic to get a full image of it. The circular object in the upper left corner is one of those flexible desk lamps.

You cannot tell very well in the photo, but the sky glass starts out lighter at the horizon - atmospheric perspective (a technique employed in landscape painting, designed to suggest three dimensional space in the two dimensional space of the picture plane, and in which forms and objects distant from the viewer become less distinct, often bluer, cooler or lighter in color, and contrast among the various distant elements is greatly reduced) and gets darker in color as it advances toward the top of the mosaic.

I need to get a bit more of the blue and quite a bit more of the tan for the right-side map area. The tan color I have is a bit too butterscotchy and too light. I need one that has more gray in it than creamy yellow.