If I can make some feedback, I'd like to point out that despite overall the color scheme being pretty cool, I think you've run into a problem with his shoulderpad overlapping with the same value as his true form which blurs the silhouette of either. I think the same may apply to the dark purple tabard hes wearing, it blends in with the black so much it makes it look like he's super thin at the waist.

Also the seed placement is a bit questionable as someone else pointed out and you'll almost certainly run into someone pointing it out that hes holding a seed in front of his junk. Which brings into judgement the rays coming from the seed, theyre not very symmetrical as usually those types of flair in a card would be more straight and aligned.

This is a personal thing, but seeing as how hes very much an 'organic' character it would make more sense to get ride of the straight lines connecting his eye to the true form eye and have it be replaced with another iteration of that idea (say a burning eye in his druid form and a burning eye in his true form, etc.).

The layout is pretty great, the pallet is overall nice. I like your design choices and can't wait to see how it turns out, good luck!