I can't add much to the sentiments already expressed except to say your essay brought tears to my eyes as I remembered spending my mom's last days with her seven years ago. They had similar attitudes and characteristics, from "go outside and play" to encouraging us to find the passion inside of ourselves, and my mom too was an artist, oils, supporting herself and us kids for thirty years. Anyway, what you wrote about your mom was indeed quite lovely.
Condolences to you and your family, Kevin.