While not a true smile or frown I gotta give you applause for the level of creativity here. The title is what helps enforce the idea of a happy staple gun fish finding some small fry staples in the ocean. Love the addition of the green yarn kelp for it helps add to the illusion of this being a seascape scene. Lighting is also very good for all objects are well illuminated without any deep or harsh shadows. Very creative!
Funny stuff! Some problems that I think will hold it down, however. The texture of your background paper shows up as a graininess similar to ISO noise. (I've done it myself. It looks smoother than it is to the camera.) Since this is an advanced editing challenge, you could have used some selective editing to smooth it out.