Nice sketch dude. Frogs and Farie huh. Pretty neat idea, but the rules said one has to be human. So be just watch out on that. About the colours, let see, if your background are going to be cool colours then i would give something warm. i’m guessing the frog will have a cool colour…? So it’ll depend on your environment. I can see her in a pinkish satin kinda outfit. maybe a little see through and the lantern that see is holding will be a goond secondarty ligth source. Oooh and maybe have fireflies all over the piece to have that nice magical feeling to it.
I hope all this babbling helps a little
will be checking again later dude.
cheers 