Save Changed Picture Box To SQL Server?

I have been working on a project. In this project I wish to be able to create electronic signatures. I have perfected the signing routine and also creating the memory astream and saving and retrieving an image. The problem comes in when I retrieve the image from the database. The image being saved does not capture the signature (the changes I've made to the picturebox)

1. I load a small bmp as the template on where to sign with by setting the picturebox.imagelocation to a network share

2. Using mousemove and mouseclick, and draw events I draw a signature on top of the picture box

3. I picturebox.image.save(memorystream) the picture box to a sql server from a button click event.

4. When I retrieve the saved image there are no edits (No signature) only the original image. I am sure that the original image is going in and that it is coming out every time.

My question is thus: How can I capture the signature that I have edited into the picture box. I have tried picturebox.save like I mentioned above and I have tried picturebox.update() but without success. Does anyone know what I missing I think that the answer lies in refreshing or updating the picturebox, but I'm not sure how.