Grief turns into creation in Jaxson1232's poem. The speaker has already cried "a river" many times, but now the tears are being used for something new: a mother. Judging by the imagery, this is a mother the speaker wishes they had, or needs, and so they imagine her into being.
She is built entirely from the ocean. Her hair is deep and dark, her eyes are the clearest blue, her skin is soft like sea glass, and her dress ripples like waves. The poem then names her as Mother Nature, someone who asks for nothing, gives everything, and loves without conditions. Even her anger is allowed to be violent, like a storm, and her joy shines.
The mood is tender and longing, but also soothing. The key detail is that she listens without judgement when the speaker rants. The poem suggests that what the speaker wants most is to be heard and loved, whatever state they're in.