When writing haiku and senyru you must keep strict Japanese form for it to be what it is, Japanese poetry;

Haiku is strictly anything that's nature: such as the sun moon and stars. Nature also refers to animals plants and inanimate objects; it can be anything not human.

As for senyru it can be all of the above with a human touch, desire or passion: key words such as I me he she saw see my etc makes a haiku a senyru.

Tanka poetry includes both senyru and haiku; couplets added to a senyru or haiku changes it form to a tanka. Once you added your masterful poems to this workshop you've collaboratively written the fourth type of Japanese poem called renga.