Ok, my considerations personally because it is gonna asking, so:
Based on that link: http://skyscraperpage.com/diagrams/?searchID=203 http://skyscraperpage.com/diagrams/?searchID=204
For sure miss the first ones of those also: http://skyscraperpage.com/diagrams/?searchID=201 the ones u/c.

1. Burj Khalifa Eduardo's look is nicier, even the effects not so blue.

2. I miss those buildings in this appearance: Shanghai World Financial Center of Ka777 is better look and more accurate detailed in all also, Nanjing Greenland Financial Complex of Eduardo's look there would be nice, Trump International Hotel & Tower of him also, and of course the wonderful Jin Mao, architetonically one of best buildings in world and tall enough to be there. Miss both of Ka777 Guangzhou International Finance Center, and Jaic Two International Finance Centre also. I personally think ESB is not so important there, because it was already too massive showing that building everywhere. I agree keeping 1WTC there because it is an updated review also to the city look. This improves sales.

3. For this sky seems too sharpy and that confund the background bringing to the front. I'd do more softly. Actually I would put some Bridges Pylons very far half transparent like in smog weather to show as tall like cloudy days. If had some like Orient Pearl of CN Tower very behind would not interfere much those empty side spaces of Burj Khalifa, imo !

My opinion only, but seems I personally not in situation to buy a poster, neither I never did.