I guess I will be the first to offer some CONSTRUCTIVE CRITICISM... First, not sure what is going on with image #1 and the large gray area in the upper left. These images are a bit over-processed and consequently there is a noticeable edge on the 2nd image and the shadow areas are some other color. Not only do you not have any black/shadow area in 3, the over processing has made the sky a mess... Your composition and subject matter look good, just your process needs work.
I think Brad has given you some useful suggestions and comments. To be a bit blunt,the images you have posted don't really work (for me at least). You say you are using a preset, I don't know which one? If you want to try HDR you may wish to consider trying one of the programs often referred to in this HDR section - Oloneo HDRengine, Photomatix, SNS etc. Most of these have a free trial version you can download and get the feel of how they work for you. HDR software has come on a lot from when it was originally introduced and now gives you the opportunity to create images that range from very natural to full-on grunge effects.
You can try Luminance HDR it is free and run on Windows and Mac. Sourceforge "Project of the Month" in May 2012 http://qtpfsgui.sourceforge.net/ May be simpler to use than CS6 as it is a specialised tool. As Brad said, maybe over processed. Practice makes perfection, have fun!