Haha, wow. Maybe you unknowingly understand it already.

Brave and intelligent thing you are doing, asking for Criticism, Copper. So, I will answer the call!

1. Which one you liked best and why.
I looked through them all, and I'd have to say Flight. The dark outlines and sharp colors give it a very nice high-contrast look. It's a simple design, yet has very good composition (working well with the Rule of Thirds). The dragon itself is well designed; the long, flowing lines work well with the general simplicity and the sense of loneliness given by there only being one figure in the painting. Definitely not the most complicated or amazingly drawn one, but it has a real professional quality.
The harvest hunt one was okay. The pretty autumn-y colors are nice and composition is decent, but the coloring on the characters takes away from it. The color of the yellow dragon, for instance, seems too close to the sky - you can separate it easily, but it doesn't "jump out". Some of the horses (namely the orange, yellow, and reddish-brown ones) look like they lost too much detail in painting. The white one in the background looks the best to me, perhaps because it has the most contrast in its shading, preserving detail and 3D-ness.

2. Which one you think should be burned and why.
Burning things is bad D=
Of course, being a critic, I'm not even going to be nice with this. I really don't like The Dreamkeeper. Okay, so there's this dragon sitting in some ruins. The painting seems kind of sloppy, but it would really take more than better painting to improve this, IMO. You're just kind of looking down at him, standing in the ruins, with a particularly dragony expression. He's not keeping any dreams; he's not looking particularly threatening; he's probably just feeling the column to see if it's alive. It would be much more powerful if the dragon were actually doing something and it had a better camera angle. And more shading.

3. How you think I could make them look a little less like the paper and pen/paint were put in a blender together at high speed.
Ink! Or it's digital equivalent! A sharp, professional inking job on pieces like The Mourner would really make them amazing to look at.
On paintings, you really want to aim for contrast. The bold transitions between lights and darks in paintings such as Transient Reality look much better than the pale, low-contrast coloring in pieces like the Harvest Hunt one.

And Faw, don't worry =P. I gave up with critiquing you and deemed you hopeless.