Boot Hill

Horo gave useful advice - softer shadows are a critical requirement for an outdoor scene. Along with that you can check to see if there is an ambient glow in some of the materials you used here. You don't need that ambient at all. If your shadows begin to darken too much all the way to black, in the sky lab (Ctrl+K to get there quickly) decrease the shadow intensity and check the "softness" button. Also, be careful that no object flows unattached in the air like the "horizontal" plank of the closest cross on the right. Due to the sepia-type of colors used I'd say the achieved mood is very appropriate for your "typical graveyard". Keep it up, and if you have the time - rework the images based on the feedback. that's the way for improving :)

Not a cheering picture but nicely done. The god's rays are very nicely placed. You could improve this picture by using a bit of soft shadows. This would increase the render time considerably, though.