Only allign 4 images

ShadowTail wrote:

My first guess would be that you do not have enough overlap between the photos. 38 is quite possibly too few for a good full body scan.

38 photos is definitely too few for a full-body scan.
I have used 34 images for this small toy:

tiger Tigger by lubenko on Sketchfab

Also 34 photos for this statuette:

owl statuette by lubenko on Sketchfab

However, there can be more problems than just overlap…