Hi Gokul,
    Thks for ur rply but im getting 404 error

my code in model.

image_variant = fields.Binary(
    "Variant Image", attachment=True,
    help="This field holds the image used as image for the product variant, limited to 1024x1024px.")
image_variant2 = fields.Binary(
    "Variant Image", attachment=True,
    help="This field holds the image used as image for the product variant, limited to 1024x1024px.")
image_variant3 = fields.Binary(
    "Variant Image", attachment=True,
    help="This field holds the image used as image for the product variant, limited to 1024x1024px.")
image = fields.Binary(
    "Big-sized image", compute='_compute_images', inverse='_set_image',
    help="Image of the product variant (Big-sized image of product template if false). It is automatically "
         "resized as a 1024x1024px image, with aspect ratio preserved.")
image_small = fields.Binary(
    "Small-sized image", compute='_compute_images',
    help="Image of the product variant (Small-sized image of product template if false).")
image_medium = fields.Binary(
    "Medium-sized image", compute='_compute_images', inverse='_set_image_medium',
    help="Image of the product variant (Medium-sized image of product template if false).")
image_variant_raw = fields.Binary()

@api.one
@api.depends('image_variant')
def _compute_images(self):
    if self._context.get('bin_size'):
        self.image_medium = self.image_variant
        self.image_small = self.image_variant
        self.image = self.image_variant
    else:
        resized_images = tools.image_get_resized_images(self.image_variant, return_big=True, avoid_resize_medium=True)
        self.image_medium = resized_images['image_medium']
        self.image_small = resized_images['image_small']
        self.image = resized_images['image']

@api.one
def _set_image(self):
    self.image_variant = self.image_medium
    self.image_variant2 = self.image_small
    self.image_variant3 = self.image

@api.one
def _set_image_medium(self):
    self.image_variant = self.image_medium
    self.image_variant2 = self.image_small
    self.image_variant3 = self.image

@api.one
def _set_image_small(self):
    self._set_image_value(self.image_small)

@api.one
def _set_image_value(self, value):
    self.image_variant = value

In view
<field name="image" widget="image" class="oe_avatar"/>
<field name="image_medium" widget="image" class="oe_avatar"/>
<field name="image_small" widget="image" class="oe_avatar"/>