Is this proper usage of the semicolon?

Is it proper usage of the semicolon to state the following:

"I cried too; it's a sad novel."
"I cried too; it's a mesmerizing autobiography."
"I love it; it's my new favorite painting."
"I hated it too; it's a poorly written and presumptuous article."

Are these statements correctly punctuated with semicolons? Are these statements correctly punctuated in general?

Thank you for your help.