I have never even touched a swooping hawk, but looking at the model and the codex (which suggests some colours) I think I can give this a go for you:
Well the Codex actually only suggests one useful colour which is "Hawk Turquoise"... another colour I have never seen. Buuut judging from the colour indicator I'd imagine it's the basecoat (what I took to be Enchanted Blue). Anyhoo, just in case I'll not use it in a little step by step:
Assemble the model without the head if it is possible. Paint the head totally white.
Body:
1. Undercoat the model white.
2. Apply a basecoat either by painting or spraying on a complete coat of Enchanted Blue over EVERYTHING (unless manually painting it on; in which case, leave the gun)
3. Give a generous wash over the entire model using 50/50 badab black and Ultramarine Blue.
4. Touch up any stray splatters and such with a nice square layer of Enchanted Blue over every flat raised area (except on the wings and gun).
5. Apply a thick highlight of Ice Blue,on the raised areas leaving Enchanted Blue only in areas where you want shading (look, for example, at the middle of the knee pads in the picture). Paint the blue feathers with Ice Blue.
6. Apply a Badab Black wash to the wings and then paint the white wings with Skull White, using more than one layer if necessary.
7. Paint the gun chaos black.
8. Apply a 60/40 Chaos Black/Codex Grey highlight onto the raised areas, but only those facing a light source (to put it simply... those pointing upwards!)
9. Apply a fine highlight to the gun with Codex Grey.
10. Paint the "gems" on the gun with Codex Grey.
11. Highlight said gems with fortress grey, leaving Codex Grey on the lower edges.
12. Put a little spot of skull white on the very top of the gem.
13. Apply a *fine* Skull White highlight on all the armour and blue feather edges.
14. Paint the gold broaches and jewelery (on which the gems rest) Mithril Silver. Then add Sshining Gold.
15. Paint the gems on the armour Chaos Black. Then add on Scab Red, Blood Red and Blazing Orange in the same way we did on the gun's gems. Finally add a little *tiny* spot of skull white to look like light reflecting.
For Biel-tan (like in the photo):
16. Paint the wing bones(?) Dark Angels Green.
17. Apply lighting on the top with 50/50 Dark Angels Green
18. Apply a fine edge highlight with Goblin Green.
Head:
1. Paint the faceplate and vents Codex Grey.
2. Paint the broaches as we did on the body.
3. Paint the piping (on the back of the helmets) Chaos Black.
4. Highlight them with a Codex Grey drybrush ('cos it's easy).
5. Paint the faceplate white again leaving a very fine amount of the Codex Grey in the recesses.
6. Paint the eyes Scab Red. Apply a dominant splodge of Blood Red and then a fine dot of Blazing Orange.
For the Exarch:
1. Paint the white parts of the crest Codex Grey.
2. Layer on Fortress grey, leaving Codex Grey in tiny spots near the helmet.
3. Highlight with Skull White.
4. Paint the green parts Dark Angels Green. If you are feeling lazy, leave them white and apply watered down
DA green to gain an illusion of shading... you can then skip step 5.
5. Highlight with Dark Angels Green.
All done
If you water down your paints properly and correctly identify the different parts of the model, I am 90% certain you'll end up with a great result
And I wish I could take credit for what I've suggested... but it's pretty much an adaptation of the
GW guide for Dire Avengers
Automatically Appended Next Post: If you couldn't detech the head and used a spraygun... Just do the head steps as normal but obviously paint it white first
I know these aren't plastic but I like to paint my Eldar heads whilst they are still on the sprue