Man, I cringe when I read this. You don't learn design from Photoshop. Or Dreamweaver. Those are tools. You learn how to design by studying the craft of design and reading about it and practicing it.
You can start developing a sense for good design by copying the work of critically acclaimed designers and taking their work apart piece by piece. You have to ask yourself why their design looks so much better than yours and get down to the basic elements and principles of design.
I'm tired of the B.S. people are passing off as design. I don't even work as a designer anymore and I'm tired of working with designers who don't even know the ABC's.
Colour, Value, Line, Texture, Form, Shape, Space, Harmony, Unity, Movement, Balance, Emphasis, Rhythm, Variety, Gradation, Repetition, Proportion, Proximity, Contrast, The golden mean, composition, etc...
These should be things you know better than the back of your hand if you want to call yourself a designer and yet 99% of the designers you will meet couldn't explain half of them.