Modelling Realistic Paper Poster With Curl? I am a 2D Illustrator with basic 3D skills using SketchUp, Fusion 360, an Keyshot.

I need to render some realistic images of what my poster designs will look like on a wall once they've been printed.

I am going for something like in the image below.  I'm trying for photo-realism, so I would like the curl to happen slightly on 2 axes at the same time, and not be perfectly symmetrical.  I am not familiar with Blender, but I am wondering if there's a way to weight paint and add a modifier for this effect to a plane that has the illustration mapped to it..?

Any suggestions?

Thanks!
Keith
I'll expand my comment above, to post an example. 

As I said, if you literally mean "like the picture below", well that paper is perfectly square and not bent in any way, imho.

This is a typical fake effect for 2d apps or web sites. The shadow is simulated as if the surface below was detached from the paper in the upper and lower part, but the paper is not curved as the shadow "visually suggests". 

It is more like if the below surface was a bit curved, like a cylinder, if you wish your "paper sheet" to be perfectly square and flat, as in the image, you need to curve the surface, not the paper, and use a light source not perfectly centered, to avoid shadow symmetry.

Here is a possible setup, in the image below ( the render was with slightly grey paper, I just later changed the paper color to blue, to make it stand out in the setup on the right side).



But if you really need the paper to be curved, and the surface flat, see other answers.