Hello there. If you want to showcase visual art, you should do so in the
Art & Design section of PokéCommunity. If it's rather a map you have created for a hack or game, you could probably post the pic in the
Map Showcase and Review thread over at
Game Development (probably regardless of if it's for a hack or a new game ^^).
In any case, tinypic or photobucket are good places for hosting pics on the web imo. Hope that helped! If you have further questions about where to post something on PC, feel free to message me.
Also, try not to double post. It's pretty unnecessary if it's only been a short while since your last post.
-locked