They look good.... I like #2 and #3.... especially the colors in #3... a bit subdued, pastel looking to my eye.

Very nice set of photos.

A new 150-600mm Sport lens on B&H is $1999.00, see website link -
https://www.bhphotovideo.com/c/product/1082151-REG/sigma_150_600mm_f_5_6_3_dg_os.html

There is a website (that I never heard of before) selling this lens listed as brand new for the "Sale Price" of $1499.99. Regular price is listed as $1800.00. Not sure if a Sigma lens can be classified "Grey Market" or not like a Nikon lens. It also says includes 1 year warranty which is in "bold red print", and if I am not mistaken, Sigma lenses come with a 4 year warranty.
http://fumfie.com/product/658.10/Sigma-150-600mm-f-5-6-3-DG-OS-HSM-Sports-Lens-for-Nikon-F-740-306-00085126740559/

Nice set of photos. Well Done.

I liked the first shot as it was. But cropping some of the path out at the bottom is a good suggestion also, and I think it certainly helps the photo. I personally would not have cropped out the birch tree on the left side of the photo. Adding more color/contrast as you did helps the photo also. The main thing with photography though is, did you like the photo as it was, did it show what you wanted it to? What looks good to me or someone else might not be what looks good to you or what you wanted to show/project in your work. Try some different crops and adjustments and see how they look to you.

Very nice photos.

Very nice photos. Good Job.

Awesome set of photos. Well Done.

Very nice set of photos. Well done.

I use Photomatix Pro and it is fairly easy to use if you use the preset adjustments. It also has adjustments that you can make yourself to tweak photos more to your personal taste instead of using the presets. At the moment Aurora is only for Mac's. As another Hog said, Trey Ratcliff made Photomatix famous and has worked with Aurora to design Aurora HDR software, and it is supposed to be better than Photomatix. I am waiting for them to come out with their version for Windows, which is supposed to be some time in 2017.

Very nice set of photos.

Very nice shot.

Very nice photos.

Jerry,

You will be very happy with it. I put one in my PC that I updated a couple of months ago with an Intel i7-6700 CPU, 64GB G-Skill ram, 64-bit Win 10. Also have 2 WD 4TB 7200 Black hard drives installed. It is very fast. Also installed new Mobo, Gigabyte Z170X-UD5. I plan on adding another M.2 drive in the second slot as soon as I get some extra funds.

WOW... what colors you captured. very nice.