To say old Japanese illustrations in Japanese, you say "Mukashi no Nihon no irasuto".
senkai arigato but Japanese would never say this just domo arigato gozaimashita is best
よかった (yokata)
Arigatou gozaimasu = Thank you very much
Japanese usually say "gochisosama" (which means "Thank you for the meal") after they eat.
You may say something like 'addo shite kurete arigato gozaimasu'.
you could possably say "Arigato Kuro Kuma" Arigato means thank you, Kuro means black, and Kuma means bear
You may say 'arigatou gozaimasu,' written in Japanese: ありがとうございます
'Kare ni chokoreeto wo kurete arigatou'.
You may say 'goshoukai arigatou gozaimasu.'
Casually: Arigatou / arigatou ne! Politely: Arigatou gozaimasu / doumo arigatou
'Thank you for the flowers' in Japanese could be translated as 花をありがとう (hana o arigatou) or simply 花ありがとう (hana arigatou).