What’s good is very personal in my opinion… I (as a guy?) prefer a female voice, I (as a musician?) don’t like too loud synth-music, with eyes closed I usually don’t use pics, if at all I prefer videos, but I guess it can help getting into the right frame of mind.
Mindfulness Meditation Williams:
Mindfulness Meditation Body Scan (UK male voice, Mark Williams; no music, no pic; Teik Yen Ko)
Mindfulness Meditation Listening & thoughts (UK male voice, Mark Williams; no music, no pic; Teik Yen Ko)
Autogenic Relaxation from the NHS for pain relief (UK female voice, no music, sunset-pic)
Progressive Muscle Relaxation (UK female voice & synth.- music, slightly obtrusive, no pic, NewcastleHospitals, there’s a male one, too)
Pain Management from the NHS guided relaxation (technique & visualization) (UK female voice, various pics, mainly water)
Surgery Preparation Meditation and Guided Relaxation (US female voice, Rebecca Clio Gould, no music, flower pics)
Preparation for a successful surgery meditation - muscle & positive language visualization deep relaxation (US male voice, David Wilson, no pic, unobtrusive music)
(As jayceason I improvised a 22’ instrumental called Weather Turns, which some people on youtube have put pics too and called relaxing. Personally I find it too obtrusive for deep relaxation, but it does calm me down when highly-strung.