Here is another example of an human/alien child.
Physically, most H/A offspring share the wide-set eyes, eye color, elongated fingers/toes (yet shorter), fins, and the top fangs of their non-human parent. From their human parent, they inherit defined noses, thicker body shapes, and most of the time, hair color (technically, the nameless-species are hairless).
Skin pigmentation is more erratic in that, minus the presence of the sheen or possible scales of the non-human parent, inter-species children can be a mixed tone of either parent. 

Here is another example of an human/alien child.

Physically, most H/A offspring share the wide-set eyes, eye color, elongated fingers/toes (yet shorter), fins, and the top fangs of their non-human parent. From their human parent, they inherit defined noses, thicker body shapes, and most of the time, hair color (technically, the nameless-species are hairless).

Skin pigmentation is more erratic in that, minus the presence of the sheen or possible scales of the non-human parent, inter-species children can be a mixed tone of either parent.