The baby sea turtle was my second origami design. If you want to fold this, the crease pattern is below.
In this case, instead of starting with circle packing, I started by making the pleats I eventually wanted to end up on the back of the shell, then just played around until I felt the head and legs looked about right. For help folding, I made an album with pictures at various stages.
Like with the lizard, multiple people folded the design after I posted it!