Two coats of the more translucent colour (like your red) should give you an even coverage.
If you want them to look a bit brighter though, you should first apply an initial coat of the colour mixed with a little grey/white/ivory/flesh - then do your two coats on top.
Colours like red, yellow, black, and white are tricky to paint because as soon as you move away from them for shades/highlights, they're not really that colour any more. Subtlety (i.e., less is more) is therefore often best when highlighting and shading these colours.
To highlight red, I'd add a tiny amount of flesh colour to the red rather than orange. This will avoid the cloaks looking orange (or too pink if you add white).
For painting eyes... Well, there are a few schools of thought!
1) Don't bother - you can't see them on the tabletop anyway, especially if the unit is ranked up closely. You simply add a little dark wash in the recess of the eyes to both hide the fact that you've not painted the eyes, and to emphasise the "recesses" a bit more.
2) Do simple eyes on some models. Paint the eyes sockets black or very dark brown. Paint the eyes in as well as you can with some white or very pale ivory. Wash with a very thinned dark brown. This defines the eyes, but doesn't go as far as doing the pupils. It's also reasonably forgiving to have a go at, but really only works if the eyes are reasonably well sculpted/defined.
3) Do complete eyes, but only on front rank/character models. Paint the eyes sockets black or very dark brown. Paint the eyes in as well as you can with some white or very pale ivory. Dot or line in (top-to-bottom stripe) the pupils with black. This is tricky and requires a sharp brush and a steady hand. Really, even practice only helps so much as I find luck is the biggest factor in getting them right first time!
4) Do all the models with full eyes. Just like (3), but to all models!
For painting eyes,
this video may help you. I find that there are lots of painting vids on YouTube, and they are very helpful is demonstrating the "how" as well as seeing the end result.
Personally, I'd suggest doing (1) for the bulk of your models, (2) for the front ranks of units, and (3) for the heroes - and only do 3 if you want to (do (2) otherwise).
I do (4), and I'm a glacially slow painter as a result!
