Q: My iphone 6 got wet from the sea water and I put my phone in rice for 6 hours and my phone still wont turn on. What do i do?

You'll have to replace it. Sorry. Water and electronics don't mix.

If you have AppleCare+ you can get a refurbished replacement at a big discount.

Otherwise, perhaps a refurbished used model from Apple will do?

CCan you still recover pictures?

If it's not powering up, No.

If it does power up, but can't be controlled because the touch screen doesn't work (touch or display) then there's a chance. Low chance under two conditions.

1. You have it set to automatically upload to iCloud Photo Library.

2. You have it set to automatically sync via iTunes.

You can always try connecting it to your computer, and if it was synced to that computer before, if it is recognized by the computer, launch your photo app and see if there's anything to import.

I would think it's because your device is dead. You've said it doesn't power on correct?

Unless you had a backup on iTunes or had copied your content to a PC or Mac, no.

Those photos & contacts are gone.