Looks pretty good, Dakota! Definitely getting the hang of it!
Some more advice: be careful about overdoing it with metallic colors when drybrushing. It's easy to get carried away and all of a sudden your model looks "silvery". A LITTLE silvery wear here and there is better from an artistic point of view. For dark tanks--gray, green, etc--use tan to drybrush, and then a little aluminum or steel to add highlights on top of that. On light tanks, like German Dark Yellow or desert colors, use a dark brown to drybrush. It makes a beautiful contrast to the base coat. Hit the second pass with some darker grey metallic to make some "worn" spots.
The dirt you did looks good. Get yourself some pigments though, and start learning about doing mud and dust with pigments. There are several brands out there to choose from. There are a lot of articles here on FSM too that can help you with methods to use these convincing products!
Here's an oldie-but-goodie I did about some Hetzer wheels that may inspire you.
http://cs.finescale.com/fsm/modeling_subjects/f/3/t/83010.aspx#810209