Good question! Acrylic on a canvas treated with gesso. It seems way more friendly for cleanup over true oil paints but it ask drys way faster if you don't put a slowing agent. All paints are not created equal, cheaper means more filler and binding agent, nicer means more pigment and vibrant colors. Not sure what these will look like in 20 years, but I hope brands like Windsor Newton maybe tested longevity at some point? The paintings I did during a few art classes 8 years ago look just fine so not too worried. Not sure what the greats like Deyoung are using these days?
Thanks all for the kind words and encouragement, I have some renewed motivation!
Here is another landscape I worked on last year, but I wasn't happy with it. I tried reworking the sky the other day and it's a little better, but I think the photo is part of the problem. Live and learn? Just going on to the next one. One of my best professors used to say "your an artist if you buy supplies and use them up! don't let them waste away in a corner"