Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download 7 Painted Cartoon Skyboxes Free.
7 Painted Cartoon Skyboxes v1.0
This content is password-protected. Please verify with comment to show the download link. Thanks.
Get seven beautiful Painted Cartoon Skyboxes for your projects
This package contains the following 7 Skyboxes:
> Ls Cartoon
> Ls Cartoon 02
> Ls Cartoon 03
> Ls Cartoon 04
> Ls Cartoon 05
> Ls Cartoon 06
> Ls Cartoon 07
Each skybox is composed of 6 textures, each texture is in psd format with dimensions of 2000 X 2000 pixels in a skybox / 6sided material.
I hope you enjoy these skyboxes.