Mix it with vodka or lemon extract (or any clear extract). The alcohol makes it shinier and more vibrant. Wait till your tiara is dry and paint on 
Speaking from experience...DON"T paint it on too thick. I couldn't get an even color, so I kept going back over one spot and it ended up melting the royal icing and the tiara broke! I had to make a whole new one. 
I have made 7 tiaras and broke 6 of them!! 
you should use rose essence (or decorators alcohol) its extremely high in alcohol level and as such evaporates very quickly.
Speaking from experience...DON"T paint it on too thick. I couldn't get an even color, so I kept going back over one spot and it ended up melting the royal icing and the tiara broke! I had to make a whole new one. I have made 7 tiaras and broke 6 of them!!
this can happen when you use ordinary alcohol as it isn' thin enough or evaporate fast enough and so soaks into the RI
wait till it is pretty much dry and paint on (if you use ordinary clear alcohol wait till it is very dry) the rose essence also stops the 'streky' look painted lustre gets with normal alcohol
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