Psychiatrists should think of patients in a holistic way, asking about diet, exercise, sleep, relationships, support systems, and different stressors in their life. This is necessary in order to make an informed assessment and a proper evaluation.
It is also important for psychiatrists to possess some degree of humility when speaking to their patients, even admitting to not knowing something if that's the case and saying they'll look into it and get back to them with a factual answer. This shows a partnership and a collaboration with the patient, which results in a more trustful relationship and ultimately a more successful outcome.
It also goes without saying that psychiatrists need to really listen to their clients and convey authentic concern, always being respectful of their patient's feelings.