In his human form:
* Tall and strong: He is described as being taller than most men, with a broad chest and powerful arms.
* Bearded: He has a long, thick beard.
* Dark hair and eyes: He has dark hair and dark, piercing eyes.
* Rough and weathered: He has a rugged, outdoor appearance, with sun-baked skin and calloused hands.
* Impressive presence: He commands respect and inspires awe due to his strength and stature.
In his bear form:
* Massive and powerful: Beorn's bear form is enormous, dwarfing even the largest bears.
* Black fur: His fur is described as being black and thick.
* Fierce eyes: His eyes burn with an intense, almost supernatural light.
* Powerful claws and teeth: He has massive claws and teeth that can inflict great damage.
Overall: Beorn is a powerful and imposing figure, both in human and bear form. He is a force to be reckoned with, and his appearance reflects his strength and fierce nature.
It's worth noting that Tolkien doesn't provide a detailed physical description of Beorn in either form. He relies on the reader's imagination to create a picture of this unique character.