HDR - From a single JPG

I have been told that in order to do HDR, we need multiples or at least 3 RAW files of the same image. Or that JPGs wouldn't be good enough due to dynamic range issues. Maybe this example of mine had "enough" dynamic range, who knows...lol!
This photo was taken during the Cyber-Shot show held recently at the AEON JUSCO Tebrau City, JB.
The other photo is from the Bob's Homestay Resort assignment, a main attraction of the resort.

What I did was to Open the JPG under Camera Raw of CS3, then changed the Mode to 16Bit and Saved it under .TIFF.
Then I opened it in Photomatix Pro, the similar process under my HDR How To's...
It looks like a pretty decent conversion to HDR, doesn't it?
You be the judge..let me know, please.

HDR
















Original JPG

















HDR Version
















Original JPG