Liquid soap is liquid soap, regardless of the body part(s) you use it on or what name you want to call it. The method of making this type of soap is the same.
Do not put bits of herbs in liquid soap. They will settle to the bottom, the lye will probably discolor the bits to black "turds", and they will be a source of food for microbes.
Dilute only with distilled water -- no aloe, no herb infusion -- just pure water.
You can use an herb infusion and/or aloe as the water phase for making the soap paste -- that would be fine.
The more botanicals (bug food) you put into the soap, the more important it is to use a preservative in the diluted product. I use liquid Germall Plus at 0.5% of the final diluted soap weight.