Limited palette Dragonfly

There's a challenge to do a limited palette pastel painting 1 yellow, 1 red, 1 blue, 1 Earth color, and black/white if needed.  Here's my palette: (didn't use the purple in the kit)

 And here's the painting I created with it:

 It's so different trying to mix dry pigments directly on the paper instead of liquid colors in a tray to get it "just right" before applying it to paper. Because of that, my dragon fly is not a neon turquoise like the photo shows. This probably isn't the best challenge for me, a beginner, but I wanted to try it anyway.

Here's the original: http://paintmyphoto.ning.com/photo/dragon-fly-2-2

There's a few more photos I want to try limited palette with but not tonight.