I'm no expert on this, just started making my own box sets.
I like the image and the overall look of your box set fits the genre.
Maybe it's just me, but the first letter of the second two words are disappearing at thumbnail size. A thicker font or close black shadow would help the letters stand out against the moon.
Small thing: The titles reading up the spines look odd to me. All the box sets I picked for models and the paper books in my bookcase have titles that read from top to bottom — the first word of the title is at the top.
Great colors and I like how you continued the image onto the spines. Wish you the best with it.
I like it but agree with Secret about making the titles on the spine read top to bottom, instead of bottom to top. I don't mean that they can't be centered, if you want, only that I would flip them around. Also agree about thickening the title on the front or adding shadowing.
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