Can someone please tell me why my color flow cat head is changing colors and getting weird white spots (see attachment). It has been just under 24 hours since I filled in the image. Is there a way to fix it? Also, how do I prevent it from happening again? Thanks!

Could it be that you didn't mix the color well before using it?
Most dark colors will lighten over time.
As for fixing you could try adding another very thin layer of flow over what you already have done - very carefully

I thought I mixed it well. Looked really good when it was done until the next morning. Must figure it out since it's for a paid job. Sigh...