Since you asked yes they are overdone. You can tell by the dark blotchy look and whoever saw a purple sky? Your use of the sliders has caused the shadowy blotchy look to the patio stones and the buildings. It would only take some tweeking to get these shots looking spectacular.
Also, the second looks crooked.
I think it would be better for you to play with the sliders and answer your own question BaGaTa. But the Smoothing Highlights slider at 0 gives dirty skies. Moving it over to 100 cleans up the skies. What you see is interactive with the sliders so just play with them until you get what you want. Actually, I dont play with them much. I mostly use the default setting and then select a preset. And Im referring to Photomatix Pro 4.
I wish you would post your pic files so we could have a go at doing HDR from them using different software. I like the subject and colors in your pics.
As to it being overdone, to my taste, yes it is. But if that's the look you seek, go for it: HDR the heck out of that sucker! A lot of people on this forum are against any HDR that looks processed. While I usually agree with that, I think it can be interesting in some shots. Excessive HDR is one more tool, which can be used wisely or foolishly. I think this is an example where it looks pretty good as a fantasy scene.
It looks like Bynx has already given you good advice on how to dial it back for a less processed appearance.
This is about as wild as I can get using Photomatix. I am using a Mac computer and have half a dozen HDR programs. Nik HDR Effex Pro, HDR Expose, DHRtist, Photoshop CS4.
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