So.....
When you start playing around with the photo you notice:
1. The girl has two faces

2. The guy doesn't have much facial hair, maybe stubble but mostly (if not all) and blur and light
3. The movement makes the guy seem much chunkier than reality (see thy and guns) - as the girl's arm is
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The hair (which looks dry) is not far removed from Nick, shoulder and neck are very similar too. The differences can be easily explained by the blur/movement.
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The lower torso is similar, in so far as you can tell.
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In this he is leaning forward v leaning slightly back. Certainly similar.
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My take is that due to the blur, you'll never be able to tell for sure. However, there is a good chance it is Nick, there are strong similarities.
Beyond that, those shoes are the same as a pair he frequently wears.
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So, no conclusion!