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Which title sounds better for my book?

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...or which one would you choose ( it's for my book I am writing & I'm having difficulty choosing a title? here they are : "Keep Your Head up Sunshine" , " On the Wings of a Butterfly", " Smile Sunshine" " Do you like Tacos?" " Rainbows & Butterflies" " I Miss You" ?
These are just a select few.... so if you have any suggestions , or choices.. PLEASE help me out :) I will greatly appreciate it!