Nice job. Nice way to break into diorama building and a great way to make your Tiger stand out.
Couple of things I would offer. As mentioned sink the T into the dirt. If the ground is already dry you can build up new ground or you can add some debris from the crater or reposition the tank untill the length of the track is down.
Pastels will do the trick on the the sheen, and a few colors of pastels. Make sure you add the same color to the lower part of the T to blend it into the surrounding area, especially the top part of the tracks (top as they run back to the front across the top of the road wheels).
The crater could use some painted clean kitty litter sprinkled inside and around. That dirt had to go somewhere.
Is that 1/72 scale
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I like seeing new work in different scales