My prior confidence (relative to what the follow-up posts have to say) of the first sentence above is low. Yes, you have to learn how to observe reality, but you'll do so as an artist, not as a more generalized agent. Drawing may call your attention to previously-unnoticed details, but these details may be irrelevant for all purposes other than drawing them. To that extent, learning to draw will not add epistemic benefit.

This statement is completely true, and I should have qualified it better (I'm going to rewrite it slightly). Future posts are going to elaborate on how drawing CAN be an exercise in rationality, if you apply the lessons in a particular way.