by Post Processing he's referring to the editing style you use, not your postings
I agree with everything HKYStormFront mentioned.
I notice a lot of either "HDR Toning" or "Shadow/Highlight" being used in these shots. i use these tools quite a bit in my photos, but only in moderation. Too much and you start to get this halo effect around high contrast areas. I personally don't like to see that, because it screams photoshop to me.
Your compositions are good and creative, its the little details and your own style that will come as you practice more. but so far
between this post and your link earlier, i would say to practice with your exposures, the daytime shots seamed a bit too overexposed, and these a bit to underexposed (a tripod might have helped you take a longer exposure). Try shooting in your camera's RAW format (not sure what your shooting with, so hopefully it has a raw format). you'll have a lot more room for to fix your exposure later in your editing that way.