A very attractive build, overall. You may be able to get those pesky vinyl track ends to join if you use a little superglue gel and a clamping tweezer. Give it time, as superglue can take a while to grip vinyl (worth a try, though it doesn't always work--it helps if the surface is free of paint).
You have opened the driver's periscope visor, but there is no periscope under it (a fault of Tamiya's designer). The periscope head slid vertically up through a slot in the driver's door. A small, wedge-shaped piece of styrene painted dark gray with a gloss black face will improve things.
Tamiya also cut corners by not including a clear headlight, and silver paint on solid styrene never looks right. Clear lenses can sometimes be found in the model car or model railroad accessories department. Alternatively, these unprotected headlights were often damaged by blast effects, and it was quite common to see them with shattered lenses. They could even be shot off entirely, leaving a bracket and loose wiring.
You've done a little weathering, but overall, the assault gun still looks extremely clean right now, more parade ground than battle ground. Your ground cover looks quite dry, which suggests dusty summer conditions. You could give your vehicle a layer of suitable dust with dry pigments or ground up artist's pastel chalks, applied with a soft paintbrush. Pick a color that is close to the exposed earth color on your base, and concentrate on the running gear and lower surfaces.