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I think that you might need to include many=true and change the source to the be related_name in the StudioProfileSerializer:
class StudioProfileSerializer(serializers.ModelSerializer):
services = StudioServicesSerializer(many = true, source = "services")
pic_of_studio = StudioPicSerializer(many = true, source = "pic_of_studio")
class Meta:
model = StudioProfile
fields = ( 'address_1', 'address_2','services','pic_of_studio' )
Source:stackexchange.com