Hey! Made a background (not finished yet):

I'm wondering which direction should I take. I drew the image using black outlines, as you can see on the car, tree and path. I then went on to remove the outlines to achieve a clean style I'm used to. For a second I thought what if I kept the black outlines? Since the caracters I have drewn have 'em.
The problem is I want everything to fit together. I thought that theoretically characters with dark outlines don't exactly wit well with backgrounds that don't have any at all (a mistake I have often made... or is it a mistake?)
Here's a quick mashup with characters:

Or should I do it the way I usually do - characters with darker outlines, backgrounds with no outlines at all.
But if I choose to use outlines (not black but darker shade of the same colour) on the background should I use them everywhere on the image? Background mountains, grass? Even clouds?
I'm wondering which direction should I take. I drew the image using black outlines, as you can see on the car, tree and path. I then went on to remove the outlines to achieve a clean style I'm used to. For a second I thought what if I kept the black outlines? Since the caracters I have drewn have 'em.
The problem is I want everything to fit together. I thought that theoretically characters with dark outlines don't exactly wit well with backgrounds that don't have any at all (a mistake I have often made... or is it a mistake?)
Here's a quick mashup with characters:
Or should I do it the way I usually do - characters with darker outlines, backgrounds with no outlines at all.
But if I choose to use outlines (not black but darker shade of the same colour) on the background should I use them everywhere on the image? Background mountains, grass? Even clouds?
