Hi Joe,
The tiger looks pretty good. Here are my observations:
1- If you're planning a diorama you will need a base. A picture frame would be a good choice. It is always nice to present your precious work on a beatiful base.
2- The joint line is visible on the barrel.
3- The tow cables look a little bit shiny. Maybe because of the flashed shot. Try to take your pictures in natural light.
4- It would be more realistic to add some mud and grass between the tracks.
Hope the critics are helpful.
Regards