As I didn’t create any assets for this one I used Daz studio for the 3D parts. The lower body with the skirt and tentacles was kind of messy so I ended up rendering tentacles, coat and skirt separately so that I could layer and edit them followed by painting shadows in photoshop. After editing and adding the photo elements I used the Prisma app to generate some filtered images for a more painted feel. Then back to photoshop to combine the filtered image with the original followed by color correction.
Here is one with a transparent background if you want to use some other background for the character.
Just use PhotoShop or Gimp and put the image on a layer above the background. You might need to delete some of the ground shadows to make it sit right.
https://imgur.com/lQJD1zY