Color palette

[furiana]

I'm trying to create a color palette for a picture. Unfortunately, I'm inexperienced with color, so I have a hard time seeing how they interact.

The colors in the picture below seem like they work to me (individually and as a palette), but I'm worried that I'm missing something. Are there any major problems with this color palette that I should know about? Clashes, muddy colors, something else that I'm not aware of...?

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The Prismacolors I'm using, seen at "full strength" in the row at the bottom of the image. Left to right:
PC927 Light Peach
PC945 Sienna Brown
PC946 Dark Brown
PC947 Dark Umber
PC903 True Blue
PC992 Light Aqua
Colorless blender, pencil version (already used in the palette below)