Rita, it's beautiful; i like the blue flowers, but if they were a bit darker they might have a bit more of a punch.
how about adding a few dark blue lines (stamens or whatever), or taking a paintbrush and some fabric paint to add a little more definition to the petals...
here are two versions modified with a few brush-strokes in fotoshop...
i'm not too keen on this one
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like this much better
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but before trying anything - i would definitely finish the other flowers and petals, once those dark blues and reds are in there - the light blue of the flowers might just be the "light" that's needed...
have fun and good luck with catching that sun