Thinking about stroke economy.... Ermmm... haha I really wasn't prepared for how few strokes 50 really is! So the top 3 were my first attempts and in 50 strokes I was getting nothing useful. I wasn't learning that much - maybe just that building faces needed more brushstrokes than you'd expect. I thought maybe it was a little TOO restrictive? So for the bottom 2 I said to myself, let's go halfway, what's the minimum number of brushstrokes that I can make while at the same time creating a picture that I feel communicates what I want?
So as you can see, at least double that 50 stroke limit. In future I'll give this another shot and restrict myself to 100 strokes and see how it goes.