Hi guys. Just wanted to let you know of some good resources for pixel art, in case anyone needed it.
1. [Let's Pixel] Top-Down Shooter Sprites. This is a useful tutorial if you ever wondered how to get a top down character right. It also has a small tutorial on doing pixel art trees at the end.
2. Pixel Art Tutorial Textures. This tutorial teaches you the basics of pixel art textures, and how to shade textures and add detail.
3. The Pixel Art Tutorial. I haven't actually gone through this, but only looked it over. It looks good enough, though.
And finally, a list of Pixel Art tutorials:
The Big List of Pixel Art Tutorials. Has lots of links related to pixel art.
I hope this helped!