Faraaidh of wudhu

Q: Will my wudhu be valid if performed with synthetic braids on?

Q:

1) Is it permissible for an unmarried girl to neaten the eyebrows (i.e. remove the stray hairs that are above the eyes and above nose area)?

2) Is it permissible to tint the eyelashes? (Black)

3) Is wudhu valid if someone has dirt or normal food particles (excluding dough) under the nails?

4) Is wudhu valid if after completing wudhu, the residue caused by water discharge from the eyes remain? (Like the discharge around the eyes when one wakes up from a sleep)

5) Is it permissible to use snail cream/ products on one’s body?

6) Is wudhu valid if there is glitter on the wudhu parts that remain even after completing wudhu i.e the glitter that comes on a person from clothing, carpet etc?

7) Can a person read salaah whilst azaan is being called?

Q: If I apply coconut oil on my hair, is my wudhu valid after oiling my hair or do I have to wash my hair with shampoo?

Q: I had an eye operation performed on my left eye. Since the operation, I have not allowed water to touch my entire face. When making wudhu, I washed all the limbs besides my face and when making ghusl, I wash my entire body starting from my neck going downwards. Are all the salaah performed in this state valid or do I need to repeat the salaah?