Comparison between the ACS/HST F606W observation (left panel), smoothed with a 3 FWHM pixel Gaussian filter for a better visualisation of the faint lensed image C.1 (marked with a white circle), and the reconstructed image systems predicted from the lens models in case 1 ((middle panel): in this case the BCG was modelled as a dPIE potential) and case 7 ((right panel): the BCG was parametrised with a Sérsic profile – see Table 5). The white circles in the middle and right panels mark the centre of the predicted counter-images. The black circle in the left panel indicates a candidate counter-image of C.1, indentified with SExtractor. The three images are WCS-aligned; the flux scale of the second and the third panel is the same.