Painting using the IPAD

I got an IPAD this past Christmas. I thought that I might use it to show my work to galleries and curators.  Then an artist told me he used it to sketch.  Then a gallery opened in Teaneck that offered classes using the IPad to create art. So  I took classes.   The two apps I use are art rage and sketchbook.   I enjoy both of them.  This past winter I spent time researching and drawing adinkra symbols of west Africa.   I created them all on my iPad.  I am thinking of a way to use them in paintings for the future. I want to use my iPad as a sketchbook, my one drawing a day.  That way I will not have all of that paper around for others to shift through when I'm gone.  Oh! did I touch a nerve, many of my art friends are wondering what will happen to their work when they are gone.  A friend of mine just gave me an inventory sheet to track paintings sold so you know who have them.  I use to know each person who owned my paintings but now either I sold too many paintings or I'm just too old to remember.  I am working again, thank God!!!