there seems to be a small amount of halo issues between the roof and the sky.
how many exposures? i would like to see some details in the shadows within the barn.
The haloing is almost unnoticeable. If this were a perfect picture I would make note of that but there is the problem with the shadows. Not enough detail. You might want to try to put the picture through Shadows/Highlights. That should do the trick.
the halo over the barn is so minor I wouldn't really worry about it now the sky portion needs an adjustment and as others mentioned shadows & highlights. Nobody else has noticed is a bit off horizontal center as well. I am making reference to the 1st image.
The white's are blown out, some minor halo's around the clouds itself and either some alignment issue and or chromatic aberation is going on around the portions of the tree my bet is on alignment issue which can be corrected with a mask layer using the tonemapped and one of your properly exposed originals.
Trust me take this as a compliment your images are not bad compared to some of the ones I have seen through out various sites.
I rather look at this one compared to what came out of the crayola factory I seen lately on another site. That image is so over saturated
basically it glows in the dark if you get my point.
Again, the point of HDR is to give some detail in both the brightest and darkest areas. Ive just put your image through Shadow/Highlight to bring out the details in the shadow areas.