I know this may be a moot point by now: I agree with other posters, the cracks look structural. The guitar must have fallen on its face at one point.
One way to fix it is to gently open up the crack by carefully bending the head back a bit, (I woudl use a long clamp to do this in a controlled manner), then inject plenty of yellow aliphatic glue into the crack.
Clamp tightly with cauls, clean up the squeeze out. and let it dry for a day or 3.
the resulting glue joint will be stronger than the original wood.
Once the crack is glued, the outwards appearance can be refinished.
In a way it is lucky that the crack is "long" and mostly parallel with the grain.
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