I can see a big difference! The 1st pic I can see nice neck muscle comming along, and rump muscle. Perhaps a bit more along the shoulder and the rump? As you have just said don't worry im in the process of putting more weight and muscle on my gelding, we are going to be moving up some more levels in eventing, and he's also nearly 18 (in september!)
If you can see in my siggy, I have some more work to do aswell! (he has a TB neck, upside down...he needs more on the topline rather than underneth! :roll: haha
Weldone with your horse, looking very very nice!