The metal parts of your piece contain lead, so please do not put it in your mouth! It is also recommended to wash your hands after handling (however, lead is absorbed through ingestion, not by touching)
Suction cups are not recommended for hanging because of their tendency to fail. Hooks screwed into a sturdy material such as a wooden window frame are the best option
Your piece has been coated and polished with carnauba wax for protection. Should it become dusty, you may use a damp cloth to clean. Cleansers and chemicals are not recommended
Lastly, your stained glass artwork was lovingly made with my own 2 hands. There may be minor imperfections as expected with any handmade item, but if you are not satisfied with your purchase, please let me know so that I can make it right!