Full Fey'ri form:

Haircolour: Platinium Blonde
Skincolour: Red
Eyecolour: Violet
Height: 6 Feet (1,80 meters)
Weight: About 160 pounds (80 Kilogramms)
Wingspan: Total 20 Feet, 10 Feet each wing (6 Meters total, each wing 3 meters)
Tail length: About 7 Feet (2,10 meters)
Horns: Curved backwards, dark grey

Half Fey'ri form:

His features are as above, only the wings and the horns are missing.

Special Features at a closer look:

Sharp, pointy teeth
A forked tongue