I started the robe as plain red. As you can see I even added some initial lights and shadows. But then I realised that this robe is big enough (I'd even say huge) to add some freehand, or maybe texture.
Because initially I was going for old and dusty look, the embroidery, I was going to mimic with freehand, would have to be fairly damaged. I wasn't sure if I'll be able to do that, so I decided to go with crumpled velvet look.
To do that I decided to try 'doting' technique presented by Alexi_Z in her video tutorial. That was my first try, so the results are far from ideal, but I'm quite happy anyway. I learnt a lot doing that piece, and the next attempt should be more successful.
On the first two pictures you can see the initial shading on the robe. It's not perfectly smooth or too contrasty, but it's OK. I'm gonna cover it with lots of dots.
When I made my mind how exactly I I'm gonna paint the robe, I did a little try on one of the creases to find out If I'm capable of pulling that off.
It looked quite nice, so I started to build shadows.
On the pictures below you can see how I was trying to control depth of the shadows not only by used colour, but also by placing more or less dark dots in the recesses.
Then I started to add dots with brighter colours to create lights. Like with painting smooth surface I was building lights gradually, by change of colour and placement of the dots.
Later it was mostly going back and forth with various shades to build a nice gradient. I used quite a lot of base colour to make shadows and lights less uniform. To soften the transitions a bit and made it look more like a fabric, not just collection of dots, I used some red glazes.
On the pictures below you can see the difference glazes did. Colour is more vibrant, and whole robe looks more consistent.
And here, finished robe, with some final highlights on the edges.
And at the end, colours I used to paint the robe, maybe someone will find it helpful. I know that I'm using some really old and discontinued GW colours, but you can easily find something similar in other ranges.
Red Gore (GW)
1st light Andrea Flesh Paint Set
Offwhite (70820 VMC)
Liche Purple (GW)
Storm Blue (GW)
Black (70950 VMC)