Mine did no stand up on its own because the feet were more turned inward. So, I edited the file, I believe yours will stand up on its own.
Here is the AI / https://makerworld.com/en/makerlab/imageTo3d?from=makerlab
Here is a helpful video if you need to simplify the mesh.
https://www.youtube.com/watch?v=rHWCCYWhCMA
The author marked this model as their own original creation.