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Converting a JPEG image to an STL file requires the following steps: First, you'll need to save the JPEG image as a raw pixel data file using specialized software such as Photoshop or GIMP. Then, import the raw data into your chosen 3D modeling program, where you can use the 'Polygon' tool to define the surfaces of each model object. Next, set up a new mesh by creating multiple vertices along a surface's edges and connecting them with lines to form faces. The mesh is essentially composed of small groups of interconnected triangles that provide shape and structure to the 3D model. You will need to repeat this process for each unique surface on your JPEG image, defining separate polygons for any complex shapes or details such as hair, clothing, etc. Once you've defined all your object surfaces, the modeling program's built-in exporter should be able to translate them into STL format. Finally, open the resulting STL file with 3D software like Blender and check its output.