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I've talked about this before, but I thought I'd cover it again since it's probably the first thing I think about with cups. So, I've set up a cup(s) and am going to draw it. First I find its boundaries: top, bottom, left, right, & ellipse bottom. I've drawn dashes to indicate these 5 boundaries in the picture to the right. I draw these same dashes on my surface (canvas, panel, etc.), with paint, trying to get them in the right places. If I have other objects in my setup, I place their boundaries as well (top, bottom, left, right), before going further.
Next I draw one vertical and one horizontal line (as shown) through the cup. Now I just need to draw the ellipse so that each of the four quadrants are equal pieces (no, you sticklers, they are not exactly equal, but I personally am not shooting for exact in my paintings - perfect is the enemy of good enough). Then I draw the two quadrants of the front (side) of the cup, making those two mirror images of each other.
The idea of drawing the dashes first and only completing the cup once you are sure these are correctly placed is to save you the effort and heartache of painstakingly perfecting your cup only to realize it needs to be moved over 1/4". Been there, done that? The "cross" helps to ensure that your proportions are correct. Handles come next.
If you have questions, please ask them in the comments so everyone can benefit from the answers. I will get to them as quickly as I am able. Thanks!