diff --git a/pictures/models.py b/pictures/models.py
index 77500d6..6413c2d 100644
--- a/pictures/models.py
+++ b/pictures/models.py
@@ -6,6 +6,7 @@
 import math
 from fractions import Fraction
 from pathlib import Path
+from types import NotImplementedType
 
 from django.core import checks
 from django.core.files.base import ContentFile
@@ -105,7 +106,7 @@ def name(self) -> str:
     def path(self) -> Path:
         return Path(self.storage.path(self.name))
 
-    def process(self, image) -> Image:
+    def process(self, image) -> Image.Image:
         image = ImageOps.exif_transpose(image)  # crates a copy
         height = self.height or self.width / Fraction(*image.size)
         size = math.floor(self.width), math.floor(height)
@@ -130,7 +131,7 @@ def delete(self):
 
 
 class PictureFieldFile(ImageFieldFile):
-    def __xor__(self, other) -> tuple[set[Picture], set[Picture]]:
+    def __xor__(self, other) -> tuple[set[Picture], set[Picture]] | NotImplementedType:
         """Return the new and obsolete :class:`Picture` instances."""
         if not isinstance(other, PictureFieldFile):
             return NotImplemented
@@ -192,7 +193,7 @@ def height(self):
         return self._get_image_dimensions()[1]
 
     @property
-    def aspect_ratios(self) -> {Fraction | None: {str: {int: Picture}}}:
+    def aspect_ratios(self) -> dict[Fraction | None, dict[str, dict[int, Picture]]]:
         self._require_file()
         return self.get_picture_files(
             file_name=self.name,
@@ -210,7 +211,7 @@ def get_picture_files(
         img_height: int,
         storage: Storage,
         field: PictureField,
-    ) -> {Fraction | None: {str: {int: Picture}}}:
+    ) -> dict[Fraction | None, dict[str, dict[int, Picture]]]:
         PictureClass = import_string(conf.get_settings().PICTURE_CLASS)
         return {
             ratio: {
diff --git a/pictures/utils.py b/pictures/utils.py
index e088042..f7e605a 100644
--- a/pictures/utils.py
+++ b/pictures/utils.py
@@ -61,7 +61,7 @@ def sizes(
 
 
 def source_set(
-    size: (int, int), *, ratio: str | Fraction | None, max_width: int, cols: int
+    size: tuple[int, int], *, ratio: str | Fraction | None, max_width: int, cols: int
 ) -> set:
     ratio = Fraction(ratio) if ratio else None
     img_width, img_height = size
@@ -82,8 +82,8 @@ def placeholder(width: int, height: int, alt):
     hue = random.randint(0, 360)  # NoQA S311
     img = Image.new("RGB", (width, height), color=f"hsl({hue}, 40%, 80%)")
     draw = ImageDraw.Draw(img)
-    draw.line(((0, 0, width, height)), width=3, fill=f"hsl({hue}, 60%, 20%)")
-    draw.line(((0, height, width, 0)), width=3, fill=f"hsl({hue}, 60%, 20%)")
+    draw.line((0, 0, width, height), width=3, fill=f"hsl({hue}, 60%, 20%)")
+    draw.line((0, height, width, 0), width=3, fill=f"hsl({hue}, 60%, 20%)")
     draw.rectangle(
         (width / 4, height / 4, width * 3 / 4, height * 3 / 4),
         fill=f"hsl({hue}, 40%, 80%)",
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 3ffc3f0..0b4ef34 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -145,14 +145,14 @@ def test_placeholder():
     assert img.height == 1200
 
 
-class TestPicture(Picture):
+class SamplePicture(Picture):
     @property
     def url(self):
         return f"/media/{self.parent_name}"
 
 
 def test_reconstruct(image_upload_file):
-    picture = TestPicture(
+    picture = SamplePicture(
         image_upload_file.name,
         "WEBP",
         "16/9",
@@ -164,7 +164,7 @@ def test_reconstruct(image_upload_file):
     assert isinstance(reconstructed, Storage)
 
     assert utils.reconstruct(
-        "tests.test_utils.TestPicture",
+        "tests.test_utils.SamplePicture",
         [],
         {
             "parent_name": "test.jpg",
@@ -173,7 +173,7 @@ def test_reconstruct(image_upload_file):
             "storage": default_storage,
             "width": 100,
         },
-    ) == TestPicture(
+    ) == SamplePicture(
         "test.jpg",
         "JPEG",
         "16/9",