My first criticism would be to post less pictures at once. It's easier if you just post a few shots so we can focus on them.
Now composition wise, I don't have anything bad to say, those are all pretty good pictures. Post-prod. wise, well, it's always a matter of taste, photography is subjective and can be 'explained', but i'll go with my personal view.
1) A bit too bright. The whites are blown in a few spots, and you end up losing some detail. Just try making it darker a tad and it's almost perfect.
2) I like the idea you went for, but I think it's just a bit over the top. Decrease the saturation and darken the highlights so tag stays gritty, I think the overall vibe will be improved.
3) Cool shot, again i'd just darken the highlights a tad, but not much.
4 + 5) I can't say I'm the biggest fan of light painting, but the images are rather pleasant to me.
6 to 8) See the comments for 3). They're cool shots, I especially like picture 7), I'd just balance out the brightness a little bit so you don't have to squint when staring at your screen.