Comet C/2025 R2 (SWAN) is currenty visible in the evening sky above Antares, in the area along the border between Ophiuchus and the tail of Serpens, known as Serpens (Cauda).  It shows a strong display of green color from the molecule diatomic Carbon (C₂).  I stacked seven images similar to this one for a total of 2 minutes 20 seconds and even that stack did not reveal any discernible tail.  The comet was easily visible in 10x50 binoculars.  Unannotated image.