Step 10: Darken the V-shaped line under the body for the beluga whale's flipper. Make the shape rounder and wider. Stretch the tops of the lines inside the body to make the flipper longer. Don't connect the lines at the top. To the left draw a smaller, V-shaped line for the tip of the flipper that's on the other side of the body.
Step 11: Use the triangular shape on the left side as a guide to draw the beluga whale's tail flukes. Follow the left edge of the guide but make the shape wavier as you darken the lines. Make the bottom and top edge of the guide rounder than the initial shape.
Step 12: Use the remaining lines and shapes as guides to draw the rest of the beluga whale's body. Simply darken the outer edges of the initial guides to create the shape of the body. As you darken the top edge, draw the line a bit farther from the guide to create the very short dorsal fin. The dorsal fin should barely be noticeable. Make it short, wide and curved at the top. Use a wavy line to darken the bottom edge. Don't overlap the flipper that's on this side of the beluga's body.
Step 13: For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all of the guides. It's okay to leave some behind. Re-draw any final sketch lines you may have accidentally erased.
Final Step: Beluga whales are white, but you can lightly add some value throughout the body for shadows. Pick the direction of the light source when shading so that the shadows are consistent with it. Use a slightly darker value along the edges and a very light value in the middle. Vary the pressure on your pencil to get different degrees of tonal value. Add the value lightly at first, and then gradually build up to the level of darkness that you want for the shadows. Add some shadows on the left side for the curves and muscle structure of the body. Shading can be time-consuming, so be patient and take breaks. It's a good idea to use reference as you draw for an accurate depiction of a beluga whale. Don't forget to pause the video after each step to draw at your own pace. For a more detailed guide on how to shade, check out this tutorial: How to shade.