Oh I simply made a copy of your layer, selected everything outside the map lines (magic wand tool), inverted the selection and used the paint bucket on that to paint everything with the darker brown. The rest is purely blending options (lower copy of the layer has zero fill opacity and an imnner bevel to raise the tables/planks/rocks, upper copy has an downward outer bevel for the sunken look of the walls). See the attached .psd.
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