Very light when I render

Hi again

Sorry if this has been asked before, but I am not sure what to search for.

I have a drawing which I have applied a soil material to which I am happy with. The problem is I can see lots of faint lines like you get when you draw a cylinder. When I render the drawing the lines disapear but all the colors go a lot lighter & I get a black background, How I keep the colors the same and remove the lines?

I have atached 2 .jpg so you can see the difference, the lighter of the 2 is the rendered versions

Thank for your help

You should use light sources (eg,sun...).Then you must adjust material

setting depend on your rendering result with lights & shadow !

Is there a tutorial on material settings/lights? I have changed the settings in Materials but it does not seem to make much differance. Is there a way of removing the lines without rendering the object?

Here is good tutorial for sun & material link..http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=10975906

Next...http://www.dailyautocad.com/render/

For your request for removing line,first set to "dispsilh" "1".

Then change to conceptual mode & edit to show material according to

my attach image!

look at the exposure controls as well.