ID:1437819
 
This was the first time I ever tried making trees. It was about 2 years ago. I spent an hour on the first one and it took me 2 minutes to make the other two. Though, they are very oddly shaped. What do you think of them?




I think it's pretty clear that you rotated and flipped parts of the tree. The light source of the first tree is opposite that of the second and third, and the last tree has no discernible light source. The leaves also look really messy, but IMO that's an acceptable style (if the rest of the art is consistent).

It looks like your file is a JPEG, which lowers the quality of pixel art significantly with artifacts. Just use PNG if you can.
Just exported them for show. One sec. Going to put in the new one.

Edit: Done
Yeah, I just got a little texture going and then.. clumped them together. Lazy work but it looked nice. Then I deleted some of the edges to make it look like the tree wasn't just all round.