need help for better result in rendering

hi kt team,
its been awhile i m not posting, here is my current project, can you help me with the rendering to be less grainy + to be high res? right now the dpi is 72 ( screen) how can i achive better resolution whitout sacrifing too much time for rendering.

i m using custom setting by the way.
thanks, cheers!

PLEASE post the exact settings used. "Custom Settings" means that it is rendering with the photon mapping and final gathering settings you provide in the Render Settings dialog.

Then, read this very carefully and try to adjust the settings yourself before posting a reply.
http://www.kerkythea.net/phpBB2/viewtopic.php?t=9803