I hate my round chubby face, chin. What do you recommend I need done? (photos)

To some degree the answer depends on whether with weight loss you retain volume in the face or not. This has a genetic determination and some people simply don't lose volume in the face even if their weight decreases. In generic terms, weight loss can help with increasing the definition of the face.Other methods that can help increase the definition include liposuction around the lower part of the cheeks, jaw line and under the chin, possibly combined with buccal fat reduction.Both your photographs are taken smiling and it is difficult to know whether the cheek volume is full or average when your faces is relaxed. Reducing the cheekbone width is generally carried out better by a reduction of bone support. I would consider it a last resort plan Computer imaging in 3D and simulation can help you understand the degree of change you wish to achieve and can qualify the type of surgery that may be suitable to assist.

I find that VASER liposuction in combination with ThermiRF are best for contouring the chin in those who are candidates, but Kybella can be used as an alternative and gets better results when combined with Thermage/Ultherapy/Exilis or Coolsculpting. I recommend getting a formal evaluation with an expert. Best, Dr. Emer

It can be hard to determine without a face-to-face consultation, but it appears that you would possibly benefit from possibly slimming the cheeks and improving the contour of the lower third of the face with buccal fat excision.  I recommend you see a specialist for this and best of luck!

From the photos you have provided, you may be a good candidate for Buccal Fat Removal, and or Chin Reshaping to help achieve some definition in your lower face. I would recommend an in-person consultation with a board-certified Plastic or facial Plastic Surgeon who is well experienced in facial work. He/she will be able to explain various options to you, and what kind of surgical options are available to help you achieve the shape you are looking for. Best of luck. 
Greg Bran MD PhD
Dual Board Certified Facial Plastic Surgeon

Options to consider are facial defatting though buccal lipectomies and perioral liposuction as well as chin reduction to reduce both its width and vertical length.