Finger clubbing.
Reflectors can be made easily and used to illuminate areas of the photograph that are in shadow, so giving the equivalent of an extra light source. Choosing the correct background guards against colour cast and distracting shadow.
Ankrett
V O
VO
Williams
I
I
Hood
C
C
D000328:Adult; D005260:Female; D006801:Humans; D010005:Osteoarthropathy, Secondary Hypertrophic / Q000151:congenital* / Q000473:pathology; D010781:Photography / Q000379:methods*