On the HOUSE layer, with the OUTLINE still selected, use Paintbrush to add shadows and highlights around door.
Pick the second lightest brown from the color swatch and paint the 'sunlit' side of door TRIM outline. That would be the left side and top side of the trim. Use the darkest brown to paint the TRIM outline on the 'shadow' side (right & bottom).
Using the darkest blue in the swatch, change the black outline of the door to dark blue, leaving the black line at the very bottom of the door.
Also use this dark blue to paint the shadow side of the door molding outlines. Refer to example image.
Use the lightest shade of blue to paint the sunlit side of the door outlines.
Create a shadow on the right side of the door handle by changing just the right side and bottom outline of the door handle to dark blue.
Select the pale gold from swatch to paint the top and side outline -- the 'sunlit' side of the door handle.
Selections > Invert
Select the darker shade from the gold swatch to paint the center space of the door handle.
De-selelct marquee.
Front Steps
Select the gray area of the front steps.
Add some texture to the steps by adding noise. Adjust > Add/Remove Noise > Add Noise
Check 'Uniform" and 'Monochrome" and enter 15% in dialog box.
Load OUTLINE selection from alpha channel again. Pick the middle gray from the GRAY swatch and paint the outline along top of each step. Pick the darkest gray from the 'noise' to paint the outline on each side of steps a mid-tone gray. Pick the dark gray from the house foundation to paint the very bottom outline of steps.
Deselect outline.
Use the dark gray from foundation to paint a dark line BETWEEN the steps, immediately above the light gray line.
Add a little shading and extra texture by painting a checkered line above the darkest gray line using the dark gray and the medium gray from the side outline of steps. (Refer to example image.)