Here are some tips for better images:

Tip 1: Ensure that the entire torso is visible.
Bad ❌ 
Bad ❌ 

Tip 2: Ensure that the image is sharp. If your phone does not focus properly, try to move further away from the object and zoom in.
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Bad ❌ 

Tip 3: Ensure that there is no shadow on top of the object.
Bad ❌ 
Bad ❌ 

That looks great!
Good ✅
Good ✅