Welcome to the vortex; hang on to your wallet. That's a nice collection of first efforts and experiments, much better than I was doing at first. Let me echo what Leo said about safety. Bad wood is dangerous, but not all firewood is bad wood. Look for bad checks and voids and either take measures or don't use the wood.
We used to discuss design and form a lot here, but lately most of the posts I see are about technique and equipment. You might consider looking at the work of some accomplished turners, such as Richard Raffan's The Art of Turned Bowls https://www.amazon.com/Art-Turned-Bo.../dp/1561589543. Last time I looked at member John Keeton's website http://johnkeeton.com/, it was full of great examples.
"Never try to teach a pig to sing. It wastes your time and annoys the pig." Robert Heinlein
"[H]e had at home a lathe, and amused himself by turning napkin rings, with which he filled up his house, with the jealousy of an artist and the egotism of a bourgeois." Gustave Flaubert, Madame Bovary