I need desperate help on this colour, on the Wanda orchid. Please help

Hmm small problem posting the photo..
http://www.google.no/imgres?q=vanda+orchid&start=97&hl=no&sa=X&biw=1241&bih=606&tbm=isch&tbnid=Rbh6D0KT6X5M:&imgrefurl=http://orchidflowers.wordpress.com/2011/08/15/tips-to-grow-vanda-orchids-in-pots/&docid=KgajQgAqgVkJNM&imgurl=http://orchidflowers.files.wordpress.com/2011/08/vanda-orchids.jpg&w=308&h=433&ei=hlKFUOK_A8iK4gSroYGQCw&zoom=1&iact=hc&vpx=459&vpy=69&dur=309&hovh=207&hovw=152&tx=71&ty=113&sig=115686355504146729843&page=5&tbnh=135&tbnw=108&ndsp=26&ved=1t:429,r:13,s:100,i:43
It is quite like this one:

Nobody?

I would probably use a food color pen or hand paint food color gel for the lines and then go back with some petal dust after the painting dries to fine tune it. Whew! That's going to be alot of work.

Thank you, but i am wondering mostly on HOW to get the blueish... colour.. What colours to use.

I would use a royal blue airbrush colour, if you want to hand paint that pattern on the petals.