Dehydrated and dull skin

Hello I’m a 23f from the uk, I was hoping to get some advice on a sustainable skincare routine/path. I would like to have bright and hydrated skin. My skin is extremely extremely dehydrated, which is annoying as I drink plenty water and eat a relatively healthy vegan diet. The skin under my eyes and on my forehead is wrinkled and dry , the wrinkles go away the odd time that my skin is brighter. The under eye skin is also really tight when pulled and looks like an older persons skin to me. My under eyes are also very very sunken and dark, and my pores are quite large .

Any advice is appreciated, Thank you :3

(Also ignore henna freckles)