Yeah. As long as you post stuff in their appropriate sections of the forum, people here are more than happy to help you out if they can.
If you're uncertain about your mapping skills and need some tips, make a map and post it in the Game and Map Screenshots thread, usually people will give you a positive, constructive critique that will help you make the next one better.
Likewise with your character or tile design, make something and put it in the WIP thread and people would be happy to give you some pointers.