I always seem to have some of these lilies blooming and I've painted them numerous times. I use to think they were Belladonna lilies, but recently learned they are Barbados lilies (Hippeastrum puniceum). The bulbs form lots of baby ones. Last spring I repotted a couple of large pots and had about a hundred bulbs.
I noticed after posting this that I had cropped out some area on the top when I matted this but didn't do it on scan, so if you notice something different, I'm putting the cropped scan in now.