Here The Sub-Elements of Water In The Avatar.

Waterbending in the avatar is one of the best and finest element, it has the healing ability, the ability to give life and the ability to also destroy. Here are the sub-elements of water in the animation.

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Icebending- Can use by Katara, Avatar Kyoshi, Avatar Korra, Pakku every waterbenders

Snowbending- Every Waterbenders too

Plantbending/
Vinebending- Use by Katara, Avatar Korra, and the rest of the Foggy Swamp Water Tribe

Blood freezing- Use by Avatar Kyoshi (Kyoshi Novels)

Bloobending- Use by Yakone, and his family before him, Noatak, Tarrlok, Katara, Hama

Steam bending- Use by Avatar Aang Katara, and other water benders during the day of the black sun

Paintbending- Every Waterbenders can do this

Spiritbending- created by Maikittuq used by Unalaq, Avatar Korra

Cloudbending- Ever Waterbenders can do this

Mudbending- Same as other every Waterbenders can do it

Mistbending- Use by Avatar Korra, Katara Waterbenders can also do this one

Blood Healing- Use by Atuat( Kyoshi Novels) Atuat can lower the temperature of water of a person inside their bodies to sustain people's lives

Healing- Use by Avatar Kyoshi, Avatar Yangchen, Avatar Korra, Atuat, Katara, Kya

Humidity Manipulation/Condensation- Use by Avatar Korra, Katara, Hama

Psychic Waterbending /- Use by Ming Hua?
Psychic Bloodbending- Use by Yakone and Amon