MINI LESSON - CUPS (7 of 8):
 I should have mentioned earlier that I use a viewfinder when I'm drawing out my composition (from life). I mark the edges of my viewfinder and panel as shown. This is a kind of simple "grid" that helps me figure out where things in my scene live.
I paint a lot of cups in stacks, and often get questions about how to draw this. Mostly I just say, "It's hard." But here's an approach that I think will help. The first thing to do is (and this is going to sound familiar) find the boundaries (top, bottom, left, right) of the whole stack, not considering the handles yet.
You can draw the entire rectangle, or just little dashes where the stack touches it, but think of the lines extended so you can compare them to other things in your setup (if there is anything).
Next you'll want to establish the tops of the cups, the ellipses, at the correct angles. If you were to imagine a line straight up and down through the center of each cup, these lines I've drawn would be perpendicular to each of those lines.
Specifically you will want to pay attention to how you are slicing up the stack. In my example, cup B is my smallest slice. Next is A, then C, then D. Measure to make sure your guesses are correct. This is a little tough because depending on where you measure each cup it will be different. So pick and spot and remember it.
Next find the angles for the sides of the cups. Note specifically how they differ from each other. For example, notice how the left side of cup A is just a slightly different angle than the left side of cup B. And how the left side of cup C is parallel to the right side of cup D.
At this point you have the general placement of your stack. Now you just have to figure out the curves, and add the handles. The top curve of the top cup is always the trickiest for me, and for that I have no easy solution, sorry. This is where you just need to make a guess, step back and see if it looks right, then try again.
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