I focused a bit on convenience. On a wide screen, the interface became cluttered. I detached and redrew the scale, reduced the space under the large icon, and placed the prediction and battle log in the center, along with the three combat buttons, reducing them so that everything fits on a 1024x768 resolution. Maybe some of these ideas will appeal to you if you're still working on it.
1) The indicator of belonging to a player is displayed not as a background behind the creature, but as a lower bar, and the digital sign indicating the number of creatures has also been moved there. At the time, I abandoned the mod that added backgrounds to creatures precisely because it made it unclear which player's turn it was.
2) Large creature portraits; this will allow you to use 128x128 images. Yes, it increases the RAM load during combat, but they are beautiful (the portraits).
I can't say that I like your final version, but some things appeal to me.
I'm currently using this:

P.S. Hmm, the screenshot didn't turn out as I intended.