Answer:
Open photo in Adobe Photoshop.
Choose the Clone Stamp Tool (use shortcut K).
Select the source (default) location in the picture (ALT + left-click) and set suitable brush diameter. The cursor has changed to reticle when you press ALT key.
Release ALT key and move the cursor to place where would you like to clone source picture. When you press left mouse button, the source area will begin to copy to this place.
Repeat these steps until you aren't satisfied with the result
