Walking the Dog on a Sunny Afternoon 12x36

Here's another big one so you won't forget me until tomorrow when I'll have a small, $60 one finished. This is a place where I used to let my dog run in a field at the foothills of the San Jacinto Mountains. Now, sadly, the area is being covered with concrete and houses. This is also available for $500 including packing and shipping. I'd appreciate an honest critique. Thank you for looking.