Pedro! Thanks a lot for your kind comments and I'm glad to be of help with the pastels!
I brought a 144-scale Me-163 with me from Moson this weekend and I think pastels can be used for the mottling on that one (or rather "those" since they come two in a packet!) so there could be more uses for pastels worth trying out!
I can't even imagine how small a 1/144 scale Me 163 must be.