Research for the 5th week of concept art
Horror Troll
First Rule: They must have a bigger upper body as trolls are very strong but however could be also small and powerful.
Second Rule: They must have tusks as trolls are mainly have tusks though out history trolls have had tusks in many styles.
Third Rule: They must carry a weapon of some kind could be anything from a bow to a heavy weapon.

Mood Board for first rule:

 
 Mood Board for the second rule different ideas for tusks:

Tusk ideas for the troll as trolls normally have tusks.