For those who think they are one thing and cannot change: you are wrong!
Picking out angles, lines, curves, shading and so on in a subject that you are drawing is a learned skill and not an innate one. Sure, some people progress more quickly than others, but that's true in all walks of life. There are many treaties that discuss the need to stop interpreting what you see (when you are drawing or sketching) and simply draw what you see (and not the interpreted object). Practice helps to stop the mind from constantly interpreting what you expect to see as opposed to what is actually there.
For example, drawing a simple line box in perspective. Our minds think of the 3-dimensional box, but on the page there are only straight lines in a horizontal plane. If you draw just one line then it is just a line. Add another and perspective may arise.
tl:dr - just practice more. It will come. [advice from a guy who rarely practices anything! Take it in the spirit intended).
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