What did you use to do the HDR? I'm by no means a photo expert, but I thought the whole point of HDR was to take pictures across all exposure levels so you can see the detail normally hidden in the shadows/bright areas of a photo. Kinda like this one that I took:
By doing an HDR I was able to get the detail in the engine bay and the cabin of the car.
On your photo all the shadow areas look very underexposed and dark. In a proper HDR (at least my understanding of it) those areas should be visible.
I tried to mess around with the picture in Photoshop a bit to try and bring out the darker areas but didn't have a ton of luck because of how saturated the dark areas were. If I went any brighter it was starting to look pretty bad.