Hey everyone! Complete newbie here.  I've been working on a background for a small amination series I'm making and I came across a problem. The drawing is supposed to be a snowy mountain peak with some tracks in the foreground and behind it should be a deep valley followed by some faraway mountains. I've added the reference image for clarification.  My problem is that the valley and mountains in the background don't really come across as intended - really far away.  The background is not 100% finished. I still have to add some clouds and a flag on top of the snowy mountain in the foreground, but I don't think that will improve anything.  Any suggestions on how I might be able to emphasize the idea of "deep valley" and "faraway mountains" while keeping the cartoony/simplistic style?  Thank you!