How does this look as a fluffy Umbar list?

The Knight of Umbar, Fell Beast
5 Black Númenóreans, Castellans of Umbar
1 Black Númenórean, Castellan, banner
6 Corsairs, spears, shields

Corsair Captain, shield
6 Corsairs, shields
6 Corsairs, spears, shields

Corsair Captain, shield
6 Corsair Reivers
1 Black Númenórean, Castellan
1 Black Númenórean, Castellan, warhorn

Bo'sun, crossbow
12 Arbalesters

Total = 799pts 13 crossbows, 7M, 48 models, 23 models left on table to break, 12 to rout.

It is fluffy enough !
It's unusual to take an all corsair force though !
Glad someone is trying.

It looks pretty fluffy. I think that you should swap the Bo'sun and one of your captains around to you can take advantage of the banner effect in combat. Other than that it looks fine in my opinion.

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"Draw your sword with a heavy heart, but swing it with a heavy hand"