usm sharpening is to increase the contrast of a picture edges. Fuzzy things become more clear picture
Smart Sharpen is to set the amount of sharpening the shadows highlights
Pixelated: Filter -> pixelated
Difference Clouds: Filter -> Render -> Difference Clouds. Difference Clouds can draw out the color of clouds.
Light used to produce lighting effects: Filter -> Render -> lighting effects
Lens Flare: Filter -> Render -> Lens Flare. You can create a lens flare feeling
Fiber: Filter -> Render -> Fibers, he can make Rainbow
Clouds: Filter -> Render -> Clouds, clouds effect may be provided
Noise reduction: Filter -> Noise -> noise reduction
Dust & Scratches: Filter -> Noise -> Dust & Scratches, can create a picture fuzzy feeling
Freckle: Filter -> Noise -> freckle, freckle not really, but the picture tends to be a very soft state
Add Noise: Filter -> Noise -> Add Noise, you can add some color.
Intermediate values: value larger the intermediate fuzzy edge softer
