disguise self and polymorph

premise: I am under the effects of disguise self to look like a human and I am in fact, an elf. I then cast polymorph on myself to turn into a T-rex and then take enough damage to make me lose concentration on polymorph, would I appear to be an elf or human after the spell drops? What if the spell was dropped due to the polymorphed T-rex running out of health?