I had fun thinking up different scenarios with this thing's anatomy and behavior. Like how some parts of it look too human to be a coincidence, but other parts show off what might be its 'true' form. I wonder what the artist had in mind beyond 'cute alien/monster girl thing'. Is it a Species-style hybrid? Maybe it has minor transformational abilities and morphed part of its form to better endear itself to the humans studying it. It has apparently perfectly human arms and hands, but neat digitigrade legs with..disturbingly adorable feet (I feel so weird).
'Because it's cute' is probably the right answer, but it's a great design and is making me want to know more about it.