Good looking Patton you got there, friend!
I would try using a dark brown or grayish-black wash around your detail areas, such as the stored hand tools, lights, panel lines, and exterior storage boxes. The old Monogram kit is a classic, but lacks a lot of detail parts, especially the grab handles here and there, but no real big issue.
Remember that a tank or an armored vehicle is a crewed by Soldiers, in the case of the M48, a crew of 4: Commander, gunner, loader, and driver. Since there's no room inside the 'fighting compartment' of the tank, most personal gear has to be stored somewhere on the exterior of the tank that doesn't interfere with crew visibility and operation of the turret and supplementary weapons' systems. If you want to kick your game up a notch, look for online pictures of M48s (or whatever you're building) for extra details that will make your tanks even more realistic and a home for the crew that serves them.
Awesome job, are you REALLY sure that this is your first kit as an adult? Looks great; keep up the good work.
TAD