Which Ones to Include?

During class, I was trying to cut down my series to 10 instead of 11.  After I had chosen 10, I changed the way I was looking at them.  First, I turned them all portrait. 

Then, I turned them landscape. 

Finally, I had some of them turned portrait and some turned landscape.

 I haven't decided which way I'm going to use.  I am leaning toward using all portrait or the mixture of portrait and landscape.