Really great work Shawn. The Indiana Jones environment turned out fantastic. A lot of nice details and some great atmosphere. And the underwater scene is also nice.
For the exterior of the temple I would suggest lightening up the stones that are carved just a tad to help them pop from the cliff walls. You still want them to look like there from the same stone, but generally when you look at Egyptian stone it appears slightly lighter once it has been carved and the exterior of the rock has been removed which has been battered on by the elements for so long. Again not a lot, but a little will help make things pop and separate a bit more.
Here is an example. Its clear its the same as the rocks its carved from but its slightly lighter giving it some nice separation.
Also for the exterior it can be a bit noisy and cluttered. You have props from trucks, boxes, barrels and stones from the temple evenly scattered about the scene. Try grouping things up and using the sand to give more areas for the eyes to rest. You dont need to fill every inch of a scene with detail, you want to have some big spaces of nothing so things dont look like a noisy mess.
That being said its a great environment