Currently, making a 3D model requires much more information to process in a computer than most 2D image files (JPG, PNG, etc.).
3D models are a collection of points in 3D space, so they have a length, width, and depth. 2D images only have length and width components.
There is no software yet that can take a single 2D image (for example, a family photo) and produce a robust 3D model. However, you can use a series of 2D images and make a 3D model through a process called photogrammetry. If you’re interested, we recommend checking out the 3D scanning resources in the 3D Scanning guide.
In addition, there are some 3D modeling programs out there that can help you sculpt or create 3D models out of single 2D images. They do require a bit of time and patience (and sometimes a small fee) but the results can be what you’re seeking to do. A good example is Smoothie-3D.