Moon Glow Stars

I have been working hard on the Moon Glow quilt blocks, and I am not enjoying this very much.  The blocks have quite a few "inset seams" and I cannot seem to get the hang of it.  I also do not like the colors.  There is a dark purple color and a very dark navy blue in some of the the stars that seems to get lost against the black background.  It looks like pieces of the stars are missing, or lopsided.  I am hoping the "connecting blocks" will lighten it up.  Also, my blocks are consistently measuring 11.5 inches, and they are supposed to measure 11.75 inches.  I'm hoping that quarter inch is not gonna cause big headaches.  Here's what I have done so far:  10 different stars.