Wa, I see you have discovered mirroring effect.
I do like Maya's Clue a lot. For the last one, my suggestion is to clone the middle just a little to make it less obvious that flipping has been done here (the water part). This will at least keep the viewer guessing, which is more fun, no?
Hi uncle WK, thanks for visiting... On this last one, I did clone the lower half of the water but now I guess it is still obvious. For mirroring, If it looks good I will do it but will not be all the time and I also think is not good. Anyway thanks again and well noted.. Btw, you shot at Changi is awesome and I have not been there for a long time..