Red for me is a terrible colour! I can't seem to get a nice transition in any direction with it. I have been doing it a few different ways on individual models for my Hordes forces for a while hoping that eventually I would hit on the right formula. I still haven't. I painted this model a little while ago and for the cloak I started with Hull Red from Vajello's Panzer Aces series. It is a lovely deep dark red and it is the colour I use for the basecoat of all my reds now. I gave this a purple wash and then I shaded it with some Rhinox Hide(GW). It is really easy to shade and doesn't need much effort. For the inside of the cloak I just added back the hull red and then one more highlight and that was that. I wanted it to remain dark. In the picture you can definitely see the brown shading and a hint of the purple wash.
For the back of the cloak I wanted a much warmer and brighter colour. I ended up with a lighter colour and quite muted. I know why and I should have thought of it at the time. I used for the final few highlights Rotten Flesh(VJ) and as this has a green tint it muted the red considerably. I shaded the cloak the same as usual and built back the original colour quickly. From there I added Blood Red(GW) to brighten everything up. That went fine and I got more or less a colour I was happy with. For the final highlights I added the Rotten Flesh. As you can see here it quickly muted the red. It even seemed to kill the previous brighter colours somewhat. I am happy enough with the end result even if it isn't exactly what I intended. I think I will use this colour if I ever manage to return to the Blood Pack I bought. I just hate the PP plastic and I can't be bothered putting in the effort required to assemble the last half of that unit.