It's not that hard tbh. This scene looks like it should be good enough for photogrammetry, firstly take an image of the background, secondly take pictures of the model [rotate it slightly every photo], thirdly download a trial version of Agisoft Metashape [or you can download Meshroom which is free but you will have to mask all images from the background], fourthly process the images according to this tutorial [ https://www.agisoft.com/index.php?id=49 ], fifthly export the mesh to Sketchfab.
And that's it [simply put].