There is a hell of a lot of debris still in the fleece. The sheep used to push their way through bushes and undergrowth to get what they wanted so even at this late stage I'm pulling out twigs, seeds burrs, grass etc., despite picking over the fleece first and pulling out loads during the washes.
Hoping that comes out during the next stage.
By the way, why comb rather than card?
If you card (hand card or drum card) without any preliminary preparation,
all that debris stays in the rolag and gets into your yarn.
So with fleece that's other than squeaky clean, you want to extract the not-fleece first.
One way is to use a wool picker, but most of us don't have room - or bravery - for one of these!
So the technique many of us use is to comb the nasties out. Wool combs come in many sizes (and prices) but do a grand job of leaving the mucky and short bits behind, leaving you with lovely organised spinnable fibre.
If you want a woollen yarn, however - lofty and full of air - then combing doesn't give you the prep you want. The combed fibres are all parallel to each other and will spin into a worsted - more compressed, more lustrous - yarn than a rolag (from hand cards) or batt (from a drum carder.)
So if you want a woollen yarn, you can comb and then card to make your rolag or batt. All the nasty stuff gets left behind at the combing stage; the rolag or batt will be lovely and clean.
Another pre-prep for carding is to 'top and tail', where you take each lock and comb out the tips and butts (either or both, as needed) before putting them onto your hand cards or drum carder. A dog comb is a good tool for doing this, or you can 'bounce' dirt out of the tips using a flick carder.
Or you can take your combed prep and 'spin from the fold', where you basically fold the sliver of organised fibres over your finger or thumb and take fibres from the side, which disorganises them somewhat and gives you a 'semi-woollen' yarn.
The Whitefaced Woodland I've had has been on the shorter end of fibres I'd comb for a worsted spin, but it has some lustre so would make a nice yarn. In general, though, I'd think you'd want to be woollen-spinning Whitefaced Woodland. (Having said which, I spin extremely short Castlemilk Moorit directly from my tiny Louet hand combs, but that's a whole other story... )
I'd recommend the dog comb then card route, I think.