Hey, some excellent work. What's even better is the passion you have towards Indy and your drive to improve your drawings.
Looking at the first posts to the last, I'm seeing a huge improvement throughout the thread. Possibly my favorite of the lot is your last Temple of Doom sketch. The likeness and proportions are really excellent.
I've noticed that you are better at drawing action shots and have trouble on the portraits...which is somewhat amusing...most people have trouble with action and excel at the portraits (as was the case with me)
The sketch cards are pretty good, in a nice loose way. My favorites are the Giant Thuggee and Indy with the spiders...good job!
Just remember to keep it loose (I should heed my own advice) and study some of those techniques online and you'll be on your way. You've got the talent and the drive, some fine-tuning is all.
Awesome!