If you like to do it then you should absolutely continue. I agree with SG about artistic expression being an outlet and it’s also a tribute to something you are involved with. I disagree about emulating the work of others. It’s a great way to learn and is often a pedagogical strategy of art instructors to have students emulate the work of others. Tracing or copying is plagiarism but if you give credit where credit is due then it’s OK in my book if you’re not trying to profit from it.

As far as your work it’s OK. From the dorsal to mouth it’s pretty good. From dorsal to tail there are some issues. The hard part about drawing animals in motion poses is maintaining proportion. Your tail at the bend seems to add or loose proportion if you imagine straitening your fish out. Also your tail is confusing the area around the anal fin. At quick glance it appears to have two anal fins split just like the belly and pectoral fins. So it looks wrong or un-natural. You may be working from another picture but try to analyze the colors and shading in the area so you can make a crisp distinctive separation of the two fins in that area.

Also your fishing line should be straight or seemingly tight with a rod, reel, and the current. With it wiggly, it looks like a piece of snapped off gear bouncing down stream that the fish will ingest or drag around.

Hope this helps.