However, you can fall into the trap of loosing realism. Remember, you don't wake up in the morning and examine every minute detail on the face unless you live with a sadistic plastic surgeon. Or you can bore the reader by starting at the beginning of the story and make them weed through the boring details. And then, of course, there is the cyberpunk method of starting the character walking around his daily life, throwing in little bits of exposition mixed into the establishment of character. Take your choice.
Many writers have problems with imagery.
The key to this is to have an image available. Some people can create them in their heads without aids. There are many tools for creating images. VR software is often helpful, if you have the ability to work with it. 3D art packages are also helpful.