The song is quite relaxing. There are a few criticisms I have:
1: It is unclear why the song is called Mario Painting. Am I missing something? Is this song a reference to a Mario game? If this song has no ties to Mario or Nintendo, you may want to change the name to fit the music's feel better. To me this feels like hanging out at home in the living room, like the start of a Pokemon game. Whatever it feels like to you, I'd change the name to represent that feeling.
2: This is a personal preference, but I found the synth sound that sounds kind of like a vocal to be a tad annoying, especially if I were to listen to the song multiple times in a row. I recommend changing that particular synth sound to something else, maybe something that still has the "chill" factor but has less character to it.
3: The song ends kind of abruptly. I'm unsure if that is what you are going for or not, so I'll say that I think it should be resolved in some way unless you intend to loop it.
I hope this helps.