左边吧

Congrats, beautiful

left one is better in colors platte
great job here  kiu ~

I like the right one more but I can see why he picked the left

It would be funnier if depending what cover of the book you choose to buy the stories's ending would depend. I have acutually bought a book like that last year.

Actually if I have to buy a book based on the cover I like, I'll definitely choose the right one..., but well, publisher know the best...

Wow the details are just incredible

I like the right one. The color of her dress is better.

Congrats on your DD

I would have picked the right one's background with the left one's characters. 

Congratulations on the DD!

I like the palette of the right, but the left feels like it has more ~life~. The warmer colors are just more alive.

I like them both!

But I can see why the publisher went with the left - the color of the heroine's outfit is more attention-getting, some of the smaller fireballs are the same shade as her dress, and the background/sky appears to be "richer" and stormier. Always a grab visually. The right image has more subdued, and even peaceful colors. Green/teal/light blue = soothing. Lavender/shades of red = more energizing. And "energizing" equates with "noticeable" and "book selling." 

Just my humble thoughts as a former editor. 

My personal choice is also the left one because it emphasize more the main subject ^_^

The right one's background seems like close level value to the main subject ^_^.

Either of them is Amazing so dont worry ^_^

Thanks for sharing your artwork!

I prefer left too - Very great artwork btw

Wonderful illustration !! I prefer the left one

I prefer the left one, it seems more dynamic to me

I like the right one slightly more