Are you doing a weird pose in the first picture? It looks like scoliosis, which would explain most imbalances. You look fairly kyphotic. Don't worry about your lower back gains so much if you are indeed doing deadlifts. I can clearly see development there. You just have to understand that the tendency in most men is for fat to accumulate around the waist. Cortisol is one of the major enemies in this context that specifically causes fat accumulation there. A low fat/high carb diet has the potential to give you the hormonal balance necessary to achieve your goals, but for long term results, fixing your spine seems more important in my opinion. The fat soluble vitamins retinol, D3, E, and K2 (MK-4) combined with a spinal traction and reinforcement program, such as hanging upside down, doing reverse hyper extensions, front squats with a pause at the bottom, front loaded barbell carries, and facepulls may fix your posture. Those vitamins will also oppose the actions of cortisol.