Amazfit Watch faces

Hi everyone!

I have an issues with my first made watchface that I don't understand. (Pusheen the cat)

All the preview looks good but when you upload the face on a watch, the background change a lot. The quality of the image downgrade and the colors turn to green, why ?

The others pictures seems all fine, only the background have this problem. Why this one is changing like that ?

Thanks

I found the solution, the picture was too big (12ko). I compressed it (4ko) and now it's working. (maybe this will help someone else)