That should become a really pretty quilt!
You've done a really good job of picking up the colors from the panel. Not too sure about the second fabric from the right though. It doesn't quite seem to fit. Maybe look for a bit darker mottled brown.
I would use only small pieces of the bright yellow. (It would be perfect for the center of a log cabin or D9P).
Like the suggestion of adding black and possibly a medium gray to your colors. You might also look for a blender with very dark green and a medium brown. Not essential but could be a nice addition.
Do keep us posted as to what you're doing with this!