I've found the best way to start to draw a picture is to use an A4 pad of cartridge paper and a selection of pencils, usually a h2 for the outline, hb, and a soft one like 3b for shading and small details, not forgetting an eraser to remove mistakes of there will be many. Here I recommend a putty rubber which is very malleable and can be shaped into a point or any shape you wish and is very good at removing lines or shading without smudging.
Then start drawing faces, more faces and then more faces. Copy photgraphs, watch peoples faces on television to see how light changes their appearance as they move about, study the different sorts of eyes, noses, mouths, ears, hair styles and bone structure. If you are a trained artist then all this will be second nature to you, but most psychic artists have little or no artisic training whatsoever so continued practice while developing the gift is essential.
Be prepared for critisism because it will help you to improve your drawing. I've found the best way to deal with this is to ask for opinions on your drawings. That way, people will be more honest with you rather than them saying nice things which they don't mean in order not to hurt your feelings.
Test your drawings in church open circles, development circles or, with permission from the church president, speaker/medium, during a service. These are your learning times so try not to get despondent if your drawing are not getting the credit for all your hard work.
When the time is right and when you feel that you need to develop more, try different materials to create your drawings. I now use a type of pencil that is all graphite with a thin plastic coating surrounding it. This gives a thin line or a half inch band approx. depending how you hold the pencil. Also they come in various grades from HB, which fairly standard and used for lines and light shade, to 9B, which is very soft and gives very dark lines and I find it useful for creating dark shades such at the roots of hair.
A lot of psychic artists use pastels to create their drawings. I have seen lots of excellent drawings (or paintings as they are known when using pastels) and without doubt have more impact and give a clearer recognition value to the recipient but as yet I haven't had much success with them. Maybe its because I'm red/green colour blind and can't see the warm tones in skin colours or more probably its because I've only just started using them and I haven't practised enough, ( I should take some of my own advice here).