I like the revisions but I'm still not sure about the dark center. Could you try putting a more orangey center in #152; a vibrant orange center (the same orange you have in the inner most ring) in #154; and a reddish orange center (like you have in the innermost ring) in #153.
I see you added an intricate design in the center. Instead of a design with 4 different sections, can you replace that little center part with a starburst?
I'd like to see a slightly more exciting font to compliment that gorgeous graphic. For the "SUN DAY" maybe a simple serif style like Sanford. And I would also like to see "GREETINGS" in black.