I love that picture.
Is that in his office in DC?
Yes. I found it in a good article about him.
The Absolutist
http://www.newyorker.com/magazine/2014/06/30/the-absolutist-2
JUNE 30, 2014 ISSUE
Many senators turn the foyers of their Washington offices into shrines to their states. Al Franken, for instance, covers the walls with pennants from every college in Minnesota. But in Cruz’s foyer, in the Dirksen Building, there are only a couple of framed portraits (of Texans who have served in the Senate) and a Dr Pepper-branded refrigerator. (Dr Pepper is headquartered in Plano.) The room looks as if Cruz had just moved in....
Cruz’s inner office is dominated by a three-panel painting of Ronald Reagan in Berlin, before the Brandenburg Gate. Reagan is Cruz’s hero, though Cruz, at forty-three, is too young ever to have voted for him. Like Reagan, Cruz believes in limited government, but his basis for that belief differs in a significant way from Reagan’s. Reagan thought limited government was a matter of political choice; Cruz believes it is a constitutional mandate. Cruz comes to that belief from a position of unusual intimacy with the constitutional text.