SR Killer Whale
First, all the commenters pointed to this poster as a popular and accepted morphological reference. See resident eco-types in the upper right. This was done for a NOAA project so the images are available for our use:
As for specific input on this drawing, they said the head is a little small, the "lips" too pronounced and the dorsal fin should be a bit smaller. They also recommend not drawing the whale with its mouth open as it's almost never done correctly.
Hopes this helps, and thanks for the chance to chime in!
Below if Jack's the first draft. Please look this over and let me know what changes are needed. Thanks.