Non-destructive editing is much better than destructive editing. The picture below is an example of using a non-destructive editing.
The original picture is shown below. 
This process involves removing the freckles, tattoos and changing the background. Below is the interface of Adobe Photoshop for this process.
A new layer (Layer 1) was created and spot healing brush tool was mainly used to remove the freckles. This tool uses samples from all layers to take the color of the skin while not directly applying the changes to the original layer. It was my first time using the healing brush and it seems easy for simple images. However, removing freckles are quite hard because there are so many freckle spots and it needs to be clicked one spot at a time to make it look good. Moreover, the spot healing brush produces more pinkish color than the skin should be, resulting in a patchy skin.
Another layer was then created (Layer 2) to remove the tattoos. This time, content aware move tool and patch tool was used to take the patterns of the smooth skin and put it on the part with tattoos. This tool was great because it is faster to be used, but there are still some patchy parts seen on the skin. Spot healing brush was used to better blend the patches, but some of them are difficult because of the lightings.
The background of the original picture was removed using eraser, background eraser and magic eraser tools. This process is difficult at the hair part of the person, specifically because of the colorful background and hair. Thus, selection tools may be difficult to detect the borders of the hair. The background needs to be removed manually using eraser tool. Then, an interior image was added as another layer behind all other layers to serve as the new background.
It was my first time using the healing and patch tools, and magic eraser tool. It was great to learn that there are some ways that makes it easy to make a picture looks better especially using non-destructive edits which make it easier to change or remove any unwanted edits.