The CGs for "Butterfly's Poison" deliberately contrast beautiful flowers (the "hana" / flower) with rotting or dangerous insects (the "chou" / butterfly). Some of the most famous CGs include:

If you are looking for specific scenes or the original 18+ CGs that were excluded from console ports, community sites often host galleries.

Finding a high-quality " Chou no Doku Hana no Kusari " (Butterfly's Poison; Blood Chains) CG download involves choosing between official high-resolution sources and community-hosted galleries. 1. Official & High-Resolution Sources

: The Steam version and Nintendo Switch version contain all the standard in-game CGs in high definition, though these are typically the censored (SFW) versions. 2. Community Galleries & Scans

However, I can guide you on to view or obtain the CGs: