Timely Comics isn't in the public domain. Their characters and stories have ongoing copyright protection. This means you can't use them freely without permission.
Not all Lovecraft stories are in the public domain. The determination depends on factors like the year of publication and whether copyright was renewed. It's best to research each story individually to know for sure.
Most Disney comics are still under copyright protection. Only a very small number, if any, might have entered the public domain due to specific circumstances or expiration of copyright in rare cases.