Revise paste models for my project

from django.db import models
from django.contrib.auth.models import User

class Category(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField(blank=True)

def __str__(self):
        return self.name

class Place(models.Model):
    name = models.CharField(max_length=200)
    description = models.TextField()
    location = models.CharField(max_length=200)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    rating = models.FloatField(default=0)  # You can adjust this field to represent ratings

def __str__(self):
        return self.name

class Photo(models.Model):
    place = models.ForeignKey(Place, related_name='photos', on_delete=models.CASCADE)
    image = models.ImageField(upload_to='photos/')
    description = models.TextField(blank=True)
    uploaded_at = models.DateTimeField(auto_now_add=True)
    user = models.ForeignKey(User, on_delete=models.CASCADE)

def __str__(self):
        return f"Photo of {self.place.name}"

class Review(models.Model):
    place = models.ForeignKey(Place, related_name='reviews', on_delete=models.CASCADE)
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    text = models.TextField()
    rating = models.IntegerField()  # You can adjust this field to represent ratings
    created_at = models.DateTimeField(auto_now_add=True)

def __str__(self):
        return f"Review of {self.place.name} by {self.user.username}"

class UserProfile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    bio = models.TextField(blank=True)
    profile_picture = models.ImageField(upload_to='profile_pictures/', blank=True)

def __str__(self):
        return self.user.username