My first illustration for a contest

[Legoras]

Hello guys! this is my first illustration for a contest and I would like to get some saviour advices from you nice people. How to finish it properly, the refinement, to integrate background with the prime draw, etc.
Thanks!

[attachment=31528]

UPDATE, going for the colour

[Legoras]

Any advice would be most welcome! the deadline is 31th august.