Debra, I would tend to agree with Marta here. Sure it is tough but its a challenge. Certainly a artist must be real good in order to work these kind of sketches.
This is what I would do. I would do a sketch of a family member that closely resembles the subject, lets say from a photo. Then if some adjusting needs to be done so be it.
While with the family and looking at the reference photo I would ask the client what is it that this particular family member has that so resembles the person they want drawn. If it is the eyes then I would draw the eyes perfectly. If it is the nose do the sames. If the mouth needs to be different ask in what way, thiner or thicker lips etc. Have some samples of lips from a book, eyes noses etc. I would draw the sketch lightly and with lighter value shadows so that I can erase if need be. I would prep everything as for the final version this time with approval. When you get the final ok then darken some shadows and lines add in the half ton and see what they think.
Before you do anything, explain to the client how difficult this is and that they are asking an almost impossible thing, but if they wish the price will be 50% more than your usual and you require a 30% nonrefundable deposit.
I hope this helps some.
All the best to you.
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