Hey, welcome to
TH (:
I love the picture of the hands, I think they're really beautiful.
If you're worried about it being too cluttered why don't you consider removing one element of the tattoo? Maybe the wings?
But I think that it would be fine with the wings if you decided to keep them, if you talk to the tattoo artist about it I'm sure they could throw in a couple of ideas and try a couple of different sketches until you find one that you really like, don't get anything done if it's not the image that you're looking for, remember you have to live with the final tattoo so don't get anything that isn't just what you want (:
Having the tattoo somewhere where it can be covered up is a really sensible idea! Your shoulder blade sounds perfect and I think it would look lovely, the back of your neck is awesome, but It would be pretty hard to keep it covered up?
In the end it's up to you, I'm sure you'll make an excellent choice about your tattoo. (: