Do not compare a hot tear to a shrinkage crack. The standard is explicit:
The photographs show increasing severity (e.g., Shrinkage Level 1 – very fine; Level 4 – severe). The casting specification (e.g., ASTM A370) will dictate the maximum acceptable level for your part. astm e125 reference photographs pdf free download
Often, casting buyers will provide their own acceptance criteria. Ask your customer if they have an internal "photo reference sheet" derived from E125. This is common in automotive and valve manufacturing. Do not compare a hot tear to a shrinkage crack