How heavily will you be emphasising the 'be any spy, any where in the world" factor? Because I think some pieces with specific recognisable regional geography or artifacts in the background would really help sell that -- the Kremlin, the Gherkin or Big Ben, Sydney Opera House, the Shanghai skyline, Times Square, the Hollywood sign, Burj-al-Arab.
Anything other than generic white dudes and busty women is good (the card game art you guys had to use in 2.0 garnered some particularly unfavourable commentary in that regard from people I've introduced the game to). Recruiting spies and operatives from cultures and ethnicities outside Central Casting is one of the major logistical challenges of any covert agency looking to expand its reach.
Investigation clue board.
Payoffs & Bribes.
(Wo)man-in-the-van / remote ops.