Enhance the experience for your audience by making unique artwork for each episode. But you need to adapt to how each app might display the image.
Apple recently emailed podcasters to remind them (again) about the requirements for being featured in iTunes. The language is very specific for easily misunderstood. I’ll explain this for you and tell you how you can change your podcast cover art or add some if you don’t already have it.
I take some time to answer questions on Audacity and podcasting.