Hi!
Here is some tips;
Use a camera with a big sensor. More pixels means more details. Use as low ISO as possible. Use as fast shutterspeed as possible (more than 1/125). Use as high apertur as possible (more than f11). Do not use taget that moves. Not even a little bit. Shot outdoors on a cloudy day. Shoot from different angel. Shoot in RAW format. Compensate for the lens in photoshop or Lightroom, or likewise. Export in *.tiff. Mask your photos.
Some tips I learn on the way. Attached is a training doll for Surgeons
Best regards
/Per