Right, I got some diamonds (from an undisclosed source) and I think it's time that I placed my order.
Flandre: I am somewhat picky regarding how she is done. Whenever I look at a character, I usually go by ZUN's in-game artwork for that character. This is especially true for Flan as she has wispy-blonde hair in her original artwork. But artists ALWAYS do it an outright yellow blonde. I hate that. I prefer Flandre to have wispy blonde. Could be just me though.
Source images:
ZUN's artwork

Other source (my former Twitter profile picture)

Patchouli: It doesn't technically matter on how she is done. I am not too picky about her. Mostly because artists tend to have an overall consensus about her design.
Source:
My former profile picture

I only have 8 diamonds for you. Hopefully that should be enough.