So many great pictures!
A humble offering taken in Chicago.
Single Image. (Lightroom -> Photoshop for perspective correction -> Nik HDR Efex for Tone Mapping -> Lightroom for HSL)
I used NIK for mine too.
I really like the concept of this image..with the clouds and all...and please take this advice as coming from a noob myself, but I might suggest you go back and do a little adjustment, to make the halo-ing around the building a bit less noticable....unless that is what you were going for.
Again, I like the image overall...but the haloing just catches my eye a bit much and think you might benefit from cutting that back a little?
Hoping this is take only as constructive criticism!!