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You watch for cars when you cross the street because you don't want to die. You look down at the ground in front of you because you want to avoid tripping in a pothole or stepping in gum. So when you walk down the street, what you see is the crowd around you, because your immediate need is to avoid pushing someone or getting pushed. Your eyes take in an overwhelming amount of things per second, and your brain only processes a tiny fraction of all that information, because you can only pay attention to so many things. This is an over-simplified explanation, but the process itself is all about simplifying complex information, so I guess it suits the point. Try to draw one of the trees - how tall is the shape? How far out do the branches go? How much space is there between branches? Is one side wider than the other? Are these colors getting reflected on something else? What/where is the light source in this piece? What angle do these branches make with that mountain, and am I replicating them right? And, perhaps most importantly, how do all these factors come together to make me believe that this thing is a tree, and it's in front of that mountain? Just look - really look - at angles and color changes. When you draw your hand, don't get caught up in calling them fingers, or knuckles, or veins, or you'll try to draw symbols again.
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When you look at a reference image, don't think about nouns. The branches are also separated, not one big arrow like yours. Along with the perspective, this piece tells a lot about color - just look at all those different greens! As this picture was apparently taken after some fires at Yosemite, you can see how some of them are blackened, and some of the leaves are dead. Even if you don't take everything from every picture, every reference image will teach you something. Look at references and try to draw from them.
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