the original reference pic was rotated so I've changed that at the begining, as seen on the gif.
Also I used a venom bodypillow sample pic first to help me with the perspective part.
In this picture I screenshotted the part where I tried to make a head but kept failing:

This was the time when I did that random venom sketch seperatedly on the canvas and decided later to use it in the picture after all... so it wasn't that "random" after all hah.