Low Poly Model Creation

Here are two images I found here. Left one is created using simple Shrink Wrap modifier, the right one is further modified manually in order to give it more style and guidance.

I am totally new to blender so can you tell me, please, what specific tools / modifiers / shortcuts are best for transforming the image on the left to the image on the right? Because, I don’t to manually move each vertex with G.

look like the one on the right has more details which means thy used Subsurf modifier , and add some variation with a Displacement modifier
but i am not sure