Yes you did a good job. I like the school of fish too
Colored pencils have such small tips it does take a lot of time and a lot of work to cover an entire page, no doubt about that.
If I may offer a critique, take a look at the reference picture of the shark and see how the body narrows considerably just prior to the tail fanning out? That is one characteristic of what makes a shark look like a shark. Another is how long and pointy their faces are.
Again, good job, keep drawing!
<insert suitably humorous or philisophical signature here>