I am a professional retoucher and have been retouching using Adobe Photoshop for almost 9 years now.
<===== I AM GOOD AT =====>
=> editing portrais (removing wrinkles, spots, stray hair etc.);
=> color management (improving or changing color of details on your photo);
=> improving sharpness, brightness, contrast, removing noise;
=> liquify (making better shapes);
=> removing or changing backgrounds;
=> old photo restoration (removing dents, cracks, noise, restoring details with high accuracy);