Would Botox Alone Help Jowls? (photo)

Botox is great for a number of applications in the upper face, but doesn't have any relevance in treating jowls.  The "11's", horizontal forehead lines, crows feet, and sometimes vertical lip lines can be minimized with appropriate doses of Botox.  These are lines formed by repetitive muscular motion and Botox temporarily disrupts the communication between nerves and muscles. A Botox treatment has about a 3 month duration of effect. 

Botox can relax the masseter muscles which would soften the jawline, but if the jowls are prominent and there is excessive sagging of tissues along the jawline, then fillers may be more suitable. Severe cases require surgery (facelift).

Thanks for your photos.  I agree with the other comments that your issues are structural in nature and will best benefit from surgery.  The jowl region is often challenging to many facelift surgeons and may need additional support beyond the SMAS approach.  Best to approach what bothers you with the most effective methodology without squandering your money on ineffective modalities that will not address your issues.