is there any others related art/design website beside DEVIANTARTS?

There are! For comic artists, there’s:
http://comicartcommunity.com/gallery/
and for digital artists, there’s:
http://www.gfxartist.com/
or
http://www.shadowness.com/
or for fantasy/sci-fi art specifically, there’s: http://www.epilogue.net/index.php

Here’s a site "for graphic artists, digital artists, animators, photographers and writers of all backgrounds and levels."
http://www.renderosity.com/

A general art community site with forums and galleries and buy/sell options is this free one, that has a nice Honor System setup if you sell art:
http://www.foundmyself.com/
or also free, with a "Premium" upgrade option for $5/month:
http://www.artwanted.com
or this one with forums and galleries with free or paid membership levels to choose from:
http://dart.fine-art.com/community.asp

If you use deviantarts for the tutorials, there’s also:
http://drawsketch.about.com/
or
http://www.instructables.com/ but this one is a bit weak on art tutorials – mostly under the art category there are things like making a Captain America shield out of a bbq grill lid or creating realistic looking fake wounds of various sorts.

If you like to mix your art and crafts there’s:
http://www.etsy.com/

For science illustration there’s:
http://www.science-art.com/

The one that the other person mentioned is good too, at
http://www.drawingboard.org/

There art all sorts of things on this here internet.
Are you looking for a specific style or media?

There are tons.

If you’re into furries — http://us.vclart.net/vcl/Artists/

Elfwood is for fantasy.

There was a great animal fantasy one with professional artists on but they had a system crash and lost all the data.