Okay, it's looking really good in general, for the neck I would recommend to draw some subtle hints of the form, a bit of meat under the jaw and then connect it to the sternum, the hips are okay but I would lower the inner "V" line as the distance from the crotch looks too big and for the outer part I would make a second incision under the one you did to hint the glute a bit and move the one you have up a little bit. On other tips, I would give him more skull on the back, and lower the clavicles a bit as he's leaning forward and relaxed and the trapeziums would be more visible, I would also lower the hint of the deltoid incision and move the chest up a bit (not as much as I did), on the legs, the line you drew coming from the inner part where there's a valley would actually go up, as that valley is limited by the sartorium, on the knee there's usually a hint to both the rotula and the head of the tibia so two bumps are good for building it, they are not as I did them but still, and I know it's not finished but I would taper the foot a bit, I would also thin out wrists and ankles for better connecting with feet and hands I drew a whacky hand structure but you can follow something similar