diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 043a44edd..e2bd57000 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -190,7 +190,7 @@ class Field(object):
             raise SkipField()
         return self.default
 
-    def validate(self, data=empty):
+    def validate_value(self, data=empty):
         """
         Validate a simple representation and return the internal value.
 
@@ -506,6 +506,7 @@ class DateField(Field):
                 default_timezone = timezone.get_default_timezone()
                 value = timezone.make_naive(value, default_timezone)
             return value.date()
+
         if isinstance(value, datetime.date):
             return value
 
@@ -560,6 +561,7 @@ class DateTimeField(Field):
 
         if isinstance(value, datetime.datetime):
             return value
+
         if isinstance(value, datetime.date):
             value = datetime.datetime(value.year, value.month, value.day)
             if settings.USE_TZ:
@@ -675,7 +677,7 @@ class ChoiceField(Field):
             for item in choices
         ]
         if all(pairs):
-            self.choices = {key: val for key, val in choices}
+            self.choices = {key: display_value for key, display_value in choices}
         else:
             self.choices = {item: item for item in choices}
 
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 8ca283876..0727b8cdf 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -205,7 +205,7 @@ class Serializer(BaseSerializer):
             validate_method = getattr(self, 'validate_' + field.field_name, None)
             primitive_value = field.get_value(data)
             try:
-                validated_value = field.validate(primitive_value)
+                validated_value = field.validate_value(primitive_value)
                 if validate_method is not None:
                     validated_value = validate_method(validated_value)
             except ValidationError as exc:
@@ -327,6 +327,7 @@ class ModelSerializer(Serializer):
         models.EmailField: EmailField,
         models.FileField: FileField,
         models.FloatField: FloatField,
+        models.ImageField: ImageField,
         models.IntegerField: IntegerField,
         models.NullBooleanField: BooleanField,
         models.PositiveIntegerField: IntegerField,
@@ -336,7 +337,6 @@ class ModelSerializer(Serializer):
         models.TextField: CharField,
         models.TimeField: TimeField,
         models.URLField: URLField,
-        # models.ImageField: ImageField,
     }
 
     _options_class = ModelSerializerOptions