Great job! The darts are perfect! As for the color- I agree- test dye a bit of yarn. Also try to use a cold dye- wool felts and shrinks in hot/warm water. :-) Knitpicks.com always has great advice and nice dyes.
Here's a pin lesson I just learned- instead of pinning across your seam line- pin parallel to it about an inch away- this way when you sew you don't have to worry about hitting the pins and don't have to remove them until you finish sewing and PRESS, Press, PRESS (it makes all the difference)