A newbie to quilting, eh? That piece sure doesn't indicate that! It's gorgeous. Personally, I wouldn't long-arm that. As unique as this is, it cries for the piecing to stand alone without competition from the quilting. I think I would do a simple outline of the design, perhaps echo a little if you think it needs it for stability. If you do not want to do this yourself, I'd consider having someone hand quilt this rather than machine quilting. I think on another comment, you mention not liking to do the binding, etc by hand. Neither do I but I love to do hand quilting. Doesn't "compute", does it? But the hand quilting is a craft on its own and the binding is a chore, I guess. Congratulations on this stunning creation!