Some of my work - Thoughts Wanted

Here's a few shots of my work. Feedback welcomed

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Random thoughts follow:
#1 Horizon off. Too much sky and too tight of a crop.
#2 Looks ok technically. But it's a lens cap, therefore it's about as uninteresting of a shot you can get.
#3 More shallow DOF. At least this one's a moderately interesting subject.
#4 Why all that negative space above his head? Weird color balance. What makes this shot interesting to the viewer?
#5 Again the all the negative space at the top the frame. Get rid of that and you can lose the vignette. This one though is the best shot by far.
#6 Why even post this shot when the stitching of the pano is all messed up?
#7 Too much negative space again. A tighter vertical crop will go along way here.

The flower pic is amazing. Making me very excited to get into photography