My usual workflow and techniques when it comes to retouching portraits includes but isn’t limited to:
Using a combination of Healing brushes and Stamp tools to patch hair gaps, existing makeup or skin textures.
Using Frequency Separation with Mixer Brush and regular paint brushes to adjust skin tone and color.
Enhancing or changing makeup and eye color using adjustment layers on different blending modes with masks and layer styles.
Using Displacement maps for different makeup changes or additions.
Using Liquify to emphasize or correct certain physical features.
Using focus and luminosity masks to change the background or adding special effects filters.
Using High Pass filters to sharpen parts of the image.
Architecture, cityscapes and interiors
My usual workflow and techniques when it comes to retouching architecture, cityscape and interior photography includes but isn’t limited to:
Using the Guided feature from the Transform Tool in Adobe Camera Raw to straighten and perspective correct larger portions of the frame.
Straightening different objects individually, depending on the lens’ distortion and characteristics.
Removing or replacing distracting objects, lights, reflections and skies.
Manually color correcting details and elements in the picture (e.g. roof color and tiling, wood textures, chromatic aberrations and lens flares).
Saturation, clarity, contrast or brightness adjustments using adjustment layers on different blending modes with luminosity masks obtained from Channels.
Adding, compositing, reframing using both existing assets or made-up tricks. Using special effects brushes to give sceneries more depth of field or a mystical feel.