The ideas are good, but nature is always a poor buy for buyers on stocks. It should be some very popular locations. Or it should be a shoot with models.
It's just better to shoot nature with a slider.
Yes, I agree, popular and well known location is very helpful, but some my seller is done 12 feet away from my front door and without any model, just leaves.
Yes model and any people is very helpful but do not guarantee any sale. I use some times slider also, but really depends, many times the most simple things work the best.
But it was type of images or footage's you must have in any micro stock portfolio.