Hi ben hooi! I felt like being a nice nice guy tonight.. So I made a little tweaking to one of your photos using adobe photoshop cs3. I've posted what I did aswell to get the final picture.. Hopefully this helps you and everyone else attain even better HDR photos! Enjoi!
Firstly I did some curves adjustments to give contrasts to the photo.. This is pretty much a good thing to do to prevent your pictures from looking flat. Trial and error till you get it the way you want it to be.
Second I didn't like the bluish tint so I used the hue and saturations to desat the blues away. You could use this tool to make other colours brighter or darker too which is a good way of drawing attention or making distractions more subtle.
Lastly I did some levels and masking to make the areas I wanted abit darker and lighter areas.. lighter..
And Finally.. the finished picture after all that simple stuff.
This is not the only things you can do to your photos, theres a ton of things you can still do! Like unsharpen masking, shadows/highlights, desaturating, blurring, lens correction so on and so on!! Experiment and you'll get results!! Hope I helped a tiny bit! =)