40k Space Wolves & Daemons Boot Sale Bargain - Help Lawnor identify and fix please (Spring Cleaning)

I’ve finished my Daemon prince.  He was mostly painted the same as before, but with a few exceptions, detailed below:

Wings

They were sprayed up the same time as the red flesh, which left them with a nice gradient I wanted to preserve, so I experimented.  I washed over them with GW Druchii Violet, trying to be a little heavier near the edges.  Once dry, a Nuln Oil wash was applied into the recesses, along the edges, and over any sections that would be darker.  I was careful to not let this pool over any of the open surfaces.  I was considering going back for a second coat of Nuln oil targeting just the darker sections, but I chose not to this time.  Perhaps next time?

Fire

I mixed up some watery Ivory and let it run in to the recesses on the shoulders.  Once dry I did this again.  Then I painted it with Mr Paint Deep Yellow.  A thinned mix, almost a wash of Mr Paint Fire Orange was used to go around the edges of this, trying to preserve a yellow middle.  A thinner mix of Mr Paint Deep Red was then used to edge that.  A little thinned ivory was added to the very middle of the bigger yellow patches.  Everything was given a careful coat or two of Coat d’Arms Yellow ink, trying to cover the Ivory, but not dilute the red or orange too much.

Horns

Undercoat white.  Wash with P3 Thornwood green.  Wash with Nuln Oil.  Wash with Thornwood Green.  Wash with Nuln Oul.  Drybrush with P3 Mouldy Ochre/P3 Menoth White Base mix.  Drybrush lightly with White.

Claws

Basically the same as before, but in a different order and heavier handed with the highlights.

Based with a mix of P3 Cryx Bane Base and VMC German Grey, allowing the Bane to dominate.  Add some GW Karak Stone to the mix and drybrush up.  Extra drybrush of just Karak Stone on the hard edges.  Wash with GW Nuln Oil, then drybrush again with the same 3 paint mix, favouring towards the tips.

Skulls

Painted the same as before (Jack Bone base, washed with Seraphim Sepia, and drybrushed with Menoth White Base), but given an extra final drybrush of Menoth White Highlight.

The tufts this time are Serious Play Scenics Burnt Grass 4mm

Update 23/7/19: After speaking with some people I decided to revisit the wings and apply a few targeted glaze layers of Nuln Oil to give them depth and darkness, while preserving some of the red.  Here is what I ended up with afer around 4 coats.