The polish is from the new color changing colours from Bluesky gel polish and this is its cold colour.
The polish is Bluesky XTC03. And when it`s warm it becomes orange ->
I used the polish itself to fill in the hearts and just outlined them with black acrylic paint.
Finished with Bluesky gel polish top coat.
Here is the same red design, made with Bluesky gel polish 521 as a base + a coat of "Santa Red Dream" over it.