Step 10: Use the remaining lines as guides to draw the rest of the Ichthyosaurus' body. Simple darken the outer edges of the initial guides to create the shape of the body. Don't overlap the fins as you draw the body.
Step 11: Darken the triangular guides on the far right side to create the Ichthyosaurus' tail fins. Use one continuous line to draw the tail so that the shape become a single shape instead of two triangles. The the left of the pectoral fin, draw a short, angled line for the pectoral fin that's on the other side of the body. To the left of the hind fin, draw a small, V-shaped line for the other hind fin too.
Step 12: 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: Shade your drawing for extra detail. Nobody is exactly sure what Ichthyosaurus looked like, so you can shade your drawing however you'd like! For this look use the pattern that you find on sharks or dolphins. First draw a line across the head and body to separate the shading pattern, and then shade the top part using a medium value. Shade lightly at first and gradually build up to darker values. For a light value, push lightly on your pencil. For a dark value push harder on your pencil. The right sides of the fins should be blank for the shading pattern. Use a light value on the top part of the body and on the left side of the dorsal fin and tail for shine. Shading can be time-consuming, so be patient and take breaks. Draw a few shadow using a light value. Pick a light source so that your shadows are consistent throughout the body. Here the light source is coming from the top, so the shadows will mainly be on the under side of the body. For a more detailed guide on how to shade, check out this tutorial: How to shade.
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