I skipped the part where I should made a sketch of the body with helping lines. I just jumped right into painting it on empty canvas. This could be perfect example for other artist of ''how u should not do things''. Sketch is very important first step.
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But it could be fixed in PS very easily. Polygonal Lasso tool to cut the head, scaling it down and masking down the hollow parts with some smudge/blur. Hurray for PS! :]