hands (petals) on the hips is hysterical

Author, this is a well made image but Sources 1, 2 and 4 are not offered under a Creative Commons license, and are not useable. Please see: http://www.pxleyes.com/blog/2009/06/how-and-where-to-find-legal-source-images/ and http://www.pxleyes.com/guidelines/photoshop/
If you can fix it and resubmit, you could tweak your shadows. The base of the container & the girl's leg don't seem to have shadows.

“What a queer planet!" he thought. "It is altogether dry, and altogether pointed, and altogether harsh and forbidding. And the people have no imagination. They repeat whatever one says to them . . . On my planet I had a flower; she always was the first to speak . . .”
― Antoine de Saint-Exupéry, The Little Prince

Good luck!

Your sources are all okay but source 5 is the download link, always use a link that shows the usage terms/license as well as the image. For this source the correct link is https://www.pexels.com/photo/sky-earth-galaxy-universe-2422/

Source 2 is a premanipulated image, and not useable.

CMYK46 is correct, Images on DeviantArt that are labeled "Premade..." are Photoshopped by the DA author and are often made using two or more images. In this case source 2 field of daisies, the DA author even states "made from my own pics".

Premanipulated images are not permitted as source as stated in the Photoshop Rules and Guidelines 5.6 "Don't use an image that has been altered by the source owner nor an entire work created by someone else."

Here you are:a new field of flower has grown.

Nice looking image, especially the yellow sky to match the field of daisies.

Not necessary, but if you have time, you might want to redirect the eyes of the pink girl to looking at the floating girl.. just a suggestion, but if she was looking at the floater it would really lock the picture together.. with the girl looking up it makes the viewer (well me anyway) to look up and out of the image... (Like I said, it could be just me).. Excellent work all round and great fixit work.. hehehe

Why do I want to see the cat/pillar holding a glass of wine for some reason?.. snorkle.. hehehe.. great job!