Personally, nearly all my profile pictures are just fictional character i like + bi flag and/or hammer and sickle in the background so idk much in the way of “professional” pfp’s lol but in that scenario I’d probably go with some sort of historical photo of a leftist figure, preferably someone less recognizable to your average lib depending on how “professional” the environment is. As much as i love ol’ joe he was absolutely correct in saying a pile of rubbish would be heaped apon his grave. So pick someone deemed more “sensible”.