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I would give both the daemonette and the horror a blue or purple wash, then go back over the raised areas with lighter shades of your base colour. Keep the highlights watered down and you should be able to achieve some good results. The armour on the daemonette, I would give a nice light brown wash (delvan mud is the old GW wash, not sure what has replaced it with the new paint kit) and once again, go back over the raised areas with some lighter reds.
You've got a good base, it does look like some of the models have had a lighter coat of paint drybrushed on top, but the models do look a bit flat. Washes are a great start, and highlights can really make a huge difference.
Hopefully that has helped.
Be Just and Fear not.