Tablīgh, ighrāq and ghuluww are distinguished primarily by the kind of possibility the claim retains, not by an intuitive measure of intensity. Tablīgh is possible both rationally and ordinarily. Ighrāq is rationally possible but beyond ordinary occurrence. Ghuluww depicts something impossible on rational grounds.
DegreeRational possibilityOrdinary possibility
TablīghYesYes
IghrāqYesNo
GhuluwwNoNo
Judging solely by emotional intensity conflates the latter two. Whether an extreme image is artistically acceptable is a further issue, not a substitute for classification.