Go to Settings > General > Usage, then tap on Photos & Camera in the Storage list. It will show you how much space is being taken up by the Camera Roll, Photo Library (albums), and Photo Streams. That will give you the storage answer.
For the number of photos, here's a quick workaround to see how many photos are in each album and Photo Stream.
In Mail, DropBox, GoodReader and most other apps that can access the Photo library, when you access the photo chooser it shows all the albums with the number of photos to the right.
I'm afraid that's all I have for you.