Optionality fields in Django model?

Question

I have this model:

class Artist(models.Model):
    name = models.CharField(max_length=50)
    pseudo = models.CharField(max_length=50)
    birth_date = models.DateField()
    country = models.CharField(max_length=50)
    instruments = models.CharField(max_length=50)
    genre = models.CharField()
    active = models.DateField()
    labels = models.CharField(max_length=255)
    website = models.URLField()

but some fields are optional (pseudo, instruments). How to solve the problem of optionality of the fields? I can add blank=True to this fields:

class Artist(models.Model):
    name = models.CharField(max_length=50)
    pseudo = models.CharField(max_length=50, blank=True)
    birth_date = models.DateField()
    country = models.CharField(max_length=50)
    instruments = models.CharField(max_length=50, blank=True)
    genre = models.CharField()
    active = models.DateField()
    labels = models.CharField(max_length=255)
    website = models.URLField()

and do not enter data, but maybe you know a better solution?