very good cartoon, sir!
i liked all the drawings, the lineworks, the whole animation's style and speed, and the face expressions/character designs of all the characters, humans, and trolls alike.
i liked how you've shown the royal family, and the castle wizard(?) (the old guy with the white beard),
and i mostly liked the 2 adventurers that were in the forest, the huge viking guy who was scared of trolls, (the irony!), and his much smaller brother in arms, who was a bit more brave.
nice story, and it seems like the start of a good series.
please keep it up, and always add more humour in your stuff, it will be very good.