Four famous
historical
Indian Gurus
(Mahasiddhas). 
They
attained great
magical powers
(= maha siddhis)
during their many
years of
meditation in caves
or at rural places.
Their main deities
or Buddha-aspects
can be seen on top
of their heads
(e.g.. Yama, White
Tara, 
White Dakini,
Dorje Chang dragon).

Kucipa, Rahula, Kapalapa, Campaka
Tibetan thangka
of unknown
Nepalese artist
*
 Taeger Collection
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