Under "other/attachments" below, I uploaded the current artwork for the show. I want it to include a picture of me (the one in current use is the best one I have, particularly with respect to resolution) and the name of my show.
The white-on-black Times New Roman was mean to correspond to the title of my blog (http://blog.cholesterol-and-health.com/) but my web site ultimately needs to be redesigned so there is nothing special about the white-on-black print. Feel free to stay in similar style or deviate, as I'm not sure what I want here.
My biggest problem with my current artwork is that the dimensions are wrong, and in the podcast app it appears as a wide picture trying to fit in a square, which looks unprofessional.
The bare minimum is to transfer this into a 1400 x 1400 px jpeg or png. If you can also improve upon my own sense of style (or lack thereof) that would be even better.
I would like my picture to take up a large amount of space within the square, in part because many people will see this on a smartphone where the icon is about a half inch square. So the picture and text both need to be big at the expense of empty space.