you really shouldn't worry about the environment / textures etc until you finish the model. I would take more time with your model a fancy environment wont make your model look any better.

Places for you to improve it:

1. the mouth, it stops... surely it should carry on into the model?
2. The arms/egs look like they are just stuck on there.. no muscle definition they don't look like they could even move at all....
3. Texture, the temp texture looks like wood... how come? look at reference of lizards/aligators/snakes/any underwater thingy look at their skins/scales etc and see how they look...

that's what I would do...



Alan