You've got some interesting ideas, but the images aren't without their issues.
1. The mono conversion is extremely mid-tone rich. Take this one back to post and spend some time working with levels adjustments to try and acheive a little more true black and white. As well, note the large dark area centre right which is very distrating.
2. This sort of thing tends to be rather over done. I would suggest a smaller aperture (Larger f #) to increase DoF and render all of the light trails more sharply, as well as trying to produce a more pleasing pattern. Right now it's rather jumbled.
3. A pleasant scene, however I would suggest cropping out the bit of roadway left foreground. As well, it would have benefited greatly from the use of a polarizing filter and a graduated ND to reduce the dynamic range between foreground and sky highlights.
4. Could be an interesting dramatic shot, but needs contrast greatly increased to produce true black and white. As well, the swing seat seems rather soft. Always be sure you know where your camera is focusing if using auto-focus.
5. This image does nothing for me. I see no drama, no main subject, and it's at least 1 1/3 stops under-exposed. Remember that any image with large areas of bright white and dark is going to be a challenge to expose correctly and will usually require supplementary lighting to acheive the best exposure result.
Just my $00.02 worth - your mileage may vary.
~John