Actually I recommend if you are an artist or someone who likes to sketch, to take photos quite often as then you will have all of the reference material that you may need for your fantasy art prints you intend to sell online or off.
I take digital photographs all the time and put them on flash drives and other storage devices for when I need to access them for drawing from, because you will find that when you have brightly coloured photos around you, the world of fantasy sketching seems to come alive.
Tree Detailed Photo Print by waynetully
Browse the Prints posters At zazzle
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So the next time you are out and about, take some quick pics of trees and other landscapes, you never know what they can be used for.