Model unrealistic shape
The shape/proportions of the of the object aren't realistic. Check reference pictures to study more the real shape of this object.
Why applying scale (and rotation) matters?
So many reasons to apply scale in Blender
Cycles / EEVEE systems
The way to improve materials
Where are my textures?
Understanding why textures are missing from your file
Wrong meshes or missing parts
Find your parent
Model Topology Issues
Why have issues?