Of all the Blender disciplines, Sculpting for me takes the most practice.
Try adjusting the size and strength of the brush, as well as moving the view for a better angle.
These are the 3 main points to continuously think about when sculpting.
Keep practicing and you will eventually get it to where you are happy.
It’s also a good idea to take a break for a day or two, with fresh eyes and a clear mind often things come a little easier.
Your shark is coming along nicely though, I see a couple of artifacts, one on the eyebrow and a couple by the back tooth.
Keep it going, keep practicing, and keep taking a break if things aren’t quite working out.
