Upload & Sell: Off
Studying photography and art composition, I learn more and I learn faster when shown a before and after. Or some sort of comparison, with an analysis of why one is better than the other. Your blog only says, "This is good and this is why." I'd suggest showing some weak composition and highlighting the weaknesses. Tell people what to avoid in addition to what to seek.
I remember once viewing an example where the author used a photo of empty row boats anchored in a bay. There were 4 boats equally spaced in a slight curve. Then he simply cloned out one of the end boats, leaving only 3, and followed with a discussion of how human perception prefers an odd number of elements over an even number. As an example, he cited research showing that humans can memorize 3 digit numbers much better than 2 digit numbers.
He followed with a series of flower photos, some with an even number of flowers, some with an odd number, which had been "rated" by test audiences. In every case the odd number photos were rated higher. I agreed, and I've always remembered that lesson.
Another lesson I read once on photo composition focused on attractions and distractions. It taught to look for the distractions and eliminate them. In your eagle photo, the white section on the bottom of the frame is a distraction. If you clone or crop it out, the focus on the eagle is stronger. And if you further desaturate the blue cast in the snow, it becomes even stronger.
And for what it's worth, I find the sand dune photo becomes stronger when the blank sky is cropped off. Just my personal opinion, driven mostly by a deep hatred for blank skies. I agree with you analysis that the blank sky draws the viewer to the top of the frame, but in this case I'm not sure that is a good thing. Leaving the focus on the stark contrast of the main dune seems better to me.