Why can I feel my left implant on the bottom and inner side of my breast? I don't have this feeling on my right breast (Photo)

First off, I think you have a very nice result. Where you feel the implant there is less tissue covering the implant. That is why most surgeons place the implant beneath the muscle so that 75% is covered by muscle and looks and feels more natural. You may have more tissue on one side vs the other. It usually does not worsen. If it really bothers you, then placement of ADM tissue may help to some degree. 

If there is very little tissue at the bottom edges of the breasts to cover the implants, it would not be unusual to feel or even see some ripples in the implants.  While it happens more with saline implants, it can certainly happen with silicone gel implants as well.  The reason why it is happening on one side and not the other is probably due to there being slightly more tissue on the right breast to camouflage the implant, or the implants are a slightly different levels.  Both of these situations can occur commonly and neither means that anything is wrong; it's just how things are sometimes.  In some instances if the rippling is bothersome enough we might do some fat grafting over the implant to add some tissue thickness for camouflage.  Keep in good communication with your surgeon about your concerns as he or she will be best suited to advise you of your options.  Good luck.