You are wrong, read the legal definition of child pornography: http://www.irishstatutebook.ie/eli/1998/act/22/section/2/enacted/en/html
“child pornography” means—
(a) any visual representation—
(i) that shows or, in the case of a document, relates to a person who is or is depicted as being a child and who is engaged in or is depicted as being engaged in explicit sexual activity,
(ii) that shows or, in the case of a document, relates to a person who is or is depicted as being a child and who is or is depicted as witnessing any such activity by any person or persons
The image I exposed meets the criteria by the legal definition of it.