Those images aren't bad. I like the more dramatic lighting and with a little judicious post production edit, can be made into exceptional images.
Pre enhancement
post enhancement
Just play with the light levels and color saturation and enhance the green spectrum a bit.....
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. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant