When taking a selfie, remember the most natural pose is still best

Where there is most feeling, there is the greatest martyrdom.

Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

...The world wouldn't be the world, without trouble.

When you draw a nude, sketch the whole figure and nicely fit the members to it and to each other. Even though you may only finish one portion of the drawing, just make certain that all the parts hang together, so that the study will be useful to you in the future.

Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.

All our knowledge hast its origins in our perceptions … In nature there is no effect without a cause … Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments … Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass.