This one will never be finished but you get an idea how those GW peices looks like at prelim stage. Typically I give my ADs color roughs so they could visualize the final piece. But for complex works you opt out color information and concentrate on composition and values first.
Battle pieces like these are usually tricky because at glimpse it's just a mess of bodies but you've to carefully plan that mess and search for happy accidents. Here I like a certain flow to Slaanesh Daemonettes but they ended up being too sexy for grim Warhammer universe.