Also, depending on the image, if you can cut around it cleanly, you can busy build a CA finish over it but it will depend on the size of the image and the pen being made, to see id you can get the label to lay flat without any wrinkles.
Like suggested above, waterslide just work better over blanks. You can brush on a layer of microsol to soften them up so they lay flat against the blank. Then let dry and build a CA finish over it.