love every photo here. I wouldn't change anything on #2 either, changing hues is going to just affect colors, which is again preferential. more important is that you caught the lines.

if i were to pick, I'd have to pick the photo I think impacts the leads, and that would be the one of the Tower Bridge. (#3). It could actually look better with color.

it's too bad the 2nd street lamp and part of the grill on pic #6 were imperfect, but then again that actually makes the picture beautiful.

judging by the pics, all using 18-55 lens. IMO your photos are a fine example on why people should focus on taking better photos, not upgrading gears. great effort!

i think the colored version nicer. it is preference though.

i was guessing based on EXIF - your shots were all within 18 - 55 range. based on your photos, even 18-55 can do it.