But keep in mind that a psychic is not the same as a psychic medium. So make sure that you contact a psychic medium if you would like to contact a passed loved one. A psychic medium reading can help you cope with the lost of a loved one and help you to get rid off any feelings of guilt. A psychic medium reading offers you prove of life after death and it can reasure you that you and your loved one will be together again. 
^ Paul Kurtz. (1985). A Skeptic's Handbook of Parapsychology. Prometheus Books. p. 29. ISBN 978-0-87975-300-9 "Florence Cook was caught cheating not only before her séances with Crookes but also afterward. Furthermore, she learned her trade from the mediums Frank Herne and Charles Williams, who were notorious for their cheating." Also see M. Lamar Keene. (1997). The Psychic Mafia. Prometheus Books. p. 64. ISBN 978-1-57392-161-9 "The most famous of materialization mediums, Florence Cook – though she managed to convince a scientist, Sir William Crookes, that she was genuine – was repeatedly exposed in fraud. Florence had been trained in the arts of the séance by Frank Herne, a well-known physical medium whose materializations were grabbed on more than one occasion and found to be the medium himself."
^ M. Lamar Keene. (1997). The Psychic Mafia. Prometheus Books. p 122. ISBN 978-1-57392-161-9 "A medium still riding high in England is Leslie Flint, famed as an exponent of direct voice. William Rauscher and Allen Spraggett, who attended a sitting Flint held in 1970 in New York, said that it was the most abysmal flop of any seance they had endured. All the spirit voices sounded exactly like the medium and displayed an incredible ignorance of nearly everything pertaining to the sitters. The "mediumship " was second-rate ventriloquism."
While I still am unsure why the translucence varies, I believe it’s a mixture of how closely they are still tied to the physical earth (more connected to earth, more ‘earthly’ looking, less connected, more ‘spirity’ looking). I also think it has to do with their skill level at being able to appear and the amount of energy they have to appear - it takes a lot of skill and energy to appear as a human in physical form without an actual physical body to work with!

In 1910 at a séance in Grenoble, France the apport medium Charles Bailey produced two live birds in the séance room. Bailey was unaware that the dealer he had bought the birds from was present in the séance and he was exposed as a fraud.[114] The psychical researcher Eric Dingwall observed the medium Bert Reese in New York and claimed to have discovered his billet reading tricks.[115] The most detailed account at exposing his tricks (with diagrams) was by the magician Theodore Annemann.[116] https://drive.google.com/file/d/1NC_exEwvIecJ9EWDa-MwzzZdzPkWWZ-H/view?usp=sharing

Cold reading also explains why psychics have consistently failed scientific tests of their powers. By isolating them from their clients, psychics are unable to pick up information from the way those clients dress or behave. By presenting all of the volunteers involved in the test with all of the readings, they are prevented from attributing meaning to their own reading, and therefore can't identify it from readings made for others. As a result, the type of highly successful hit rate that psychics enjoy on a daily basis comes crashing down and the truth emerges – their success depends on a fascinating application of psychology and not the existence of paranormal abilities.[50] https://drive.google.com/file/d/1Jp5LrVrI3j2JYGsZHnjPsuFPsq2Uv4mL/view?usp=sharing
The techniques used in a love & relationships psychic reading vary depending on the psychic's abilities, preferences, and expertise. These techniques may include tarot cards, numerology, astrology, and other forms of divination. Love & relationship psychic guides rely on their clairvoyance, wisdom, and other medium senses to reveal information about your love life and romantic relationship to you.
If everything is currently going well and you have a healthy relationship, your psychic reading can provide the reassurance you are looking for that your instincts are right – everything is fine. On the other hand, the reading may also alert you to a lurking issue that you will soon have to overcome in order for the intimate relationship to survive.