PCB Layout Check

[skypn]

My latest PCB layout.
Schematic:

Tracings:

Component Placement:

Please note that we're looking at the underside, copper side of board, so the components, except for the pot, are "backward"
I used PS to do the layout, as I am very familiar with it. I color coded the nodes, then made all the tracings black. I found the learning curve of PCB design software too steep.
Any corrections, or suggestions are greatly appreciated.