Four layers. I opened the file in CorelDRAW, stacked the layers, and played around with colors until I had something I liked, then went to my paper stash and pulled papers, then back to the computer to try the actual colors I had. Cut with Silhouette. (Set to plain cardstock and double cut.)
The file is from So Fontsy. I did a fair amount of cleaning up of excess nodes on the file before cutting.
And wow, I just noticed a tiny piece of pink that needed to get weeded. Can you see it? (To the right of the top of the red heart.)
Very pretty. Lovely colors too. isn’t it weird how you can see things in a picture that your eye glosses over? I never would have noticed unless you pointed it out.
Spray glue! I was wondering how you got it all to stick together. Do you use a respirator with that stuff? I haven’t used it before.
The colors and style of the heart reminds me of stained glass. I hope that whomever has it incorporates it into their daily life.
Congratulations! Your superb craft is one of this week’s Featured Projects! 
