Brahma,
The general meaning given to the appearance of an owl in a person's dream is as follows.....
To see an owl in your dream symbolizes wisdom, insight, magic, expanded awareness and virtue. You are highly connected to your intuitive senses and psychic power. The owl is also synonymous with death, darkness and the unconscious. The appearance of an owl may be telling you to let go of the past or certain negative behaviors.
Source:
http://www.dreammoods.com/dreamthemes/birds.htm
However the meaning of the smiling owl in the tree of temple flower in your dream would be specific and probably unique to your particular system of beliefs, as well as to your stage of spiritual development.
Any dream where something or someone is smiling at you is thought to be symbolically providing you with both comfort and assurance that you are on the right track to success. Your unconscious mind is pleased with you and your progress?
Namaste,
EoT :smt020