"Long hair" can be jIb tIq. This is also the most common way to refer to a single long hair or several strands or a lock of long hair no longer on someone's head. A common way to refer to a coiffure of long hair is to say that the hair has grown: Qa jIb (even if you're talking about a wig!).
Similarly, jIb run can be used for "short hair," though another, perhaps more common, locution is to say the hair has been cut or trimmed: jIb chIplu'bogh (or jIb chIpbogh if the cutter is known or jIbwIj DachIpbogh if you cut my hair, and so on). A single short strand of hair or a lock of shorter hairs no longer on a head would be jIb wIl rather than jIb run. How short "short" is and how long "long" is depends on context. A "long stick" may be a meter; a "short rope" may be a meter.
'ej bejtaHvIS
baS moj jIb
And turned to steel
Before his eyes.
jIbDaj lumeQmoH
qul bIQtIq qulHommey
Caught his hair,
Caught his hair.