Hello! I'm really bad at spriting armies at PW's scale so I figured I'd try my hand at mapping - let me know what you think of my first attempt! (Apologies for the generic name. :I)

Generally starting with "Hi, I suck!" is a bad idea, because you sometimes end up proving yourself completely wrong, as with this.

This is really great, my only complaint would be that you shouldn't vary the background on LOW levels at least, as it can lead to difficulty in editing, but those colors are pretty plain and contrasted so I think it would be fine.This and the fact that there's not much of a way to enter from the left, there's only a few things I see that could be fixed. This would be a great map even if it wasn't your first.
Also usually maps don't have suns, but I think what you did here is perfectly acceptable and awesome.

I rather like it, but I find it rather odd that the oil-filled cave is brighter than the soil. It's quite contrasting to the stone tunnel.

Updated the OP with a bunch of new changes.

- Darker oil caves. (Good catch, I think I was looking at someone else's map for help so I used their general lighting schemes.)
- Opened up the mine and added an underground cave with Convenient Luminescent Cave-Lighting Fungus™ so that armies have a couple of places to enter on the left. People with large armies will just have to deal with it or invent flying machines.
- Added a few more rocks.
- Fixed some misplaced pixels in the background.

Let me know what you think!

It may just be me, but there seems to be a difference in the colour of the sky between the tunnel support plank and the cave entrance.