Instead if making two sharks to practice further, I sculpted this cat. It proved more difficult than I had anticipated. This is a render of my nth attempt ... My previous sculpts are nightmare fuel :p
I'm currently trying to retopologize the mesh. 
So far I have been able decrease the density on the top of the head. I'm currently working on making continuous loops around the eyes. 
I'll do something similar around the mouth and nose, and then I'll try to connect everything. At the moment, everything is a mess around the eyes, outside my rings. Hopefully, rewatching the Mesh Modeling course will help me clean it all up. But that is for another day. I will leave this sculpt to rest for a while and dive into the next part of CORE.
I love that shark! It totally looks like it could join the gang from Finding Nemo!
Awesome work on the cat too. You took a huge step from one to the other and while you might not be 100% happy with it just know that it's not an easy one. I think you did great!