Great to see you take on the Eldar! As for me the Eldar is all about painting and orks about converting. They complement eachother very well. Now for your test-scheme.
I'm not 100% sure about the pink on the armour. I think it would work better with only blue/purple. Instead keep the pink as a spot-colour and use it on cloths and maybe spiritstones. Also I'm not fond of guns with the same scheme as the armour, it blend together and hard to pick out. Try to have it all blue instead and have less blue on the acctual model. Maybe only helmet, shoulders and knees. The barrel on the Gun could be a metallic or bone.
The blue is though a very nice colour that will light up any battlefield they set their feet on.