Choose two images. Copy and paste as a new layer. Then use the light dark blend modes (in layers)to achieve desired effect. A bit of cloning and the push tool was used. Color management tools were used to give the picture the desired saturation and contrast. Read some books on digital manipulation. Any program will do. They are all the same. Yes there are thousand dollar pro editing programs. For those I suggest a full time course at school to justify and understand what you are using.