My first few attempts, C&C please!

[Sachphotography]

On picture #5. Use a ND filter and stop down to a f/8ish or so setting. Leave the shutter open longer and you will capture the flowing smooth creamy lines of that waterfall adding a amazing sense of motion. Plus it just looks cool.

 

[kreuzberg]

Thanks Sachphotography for taking the time to edit my pictures.

Ive been using a Hoya Skylight filter that came with my camera as I assumed it would be best for outdoor photos, how does this differ from a polarising filter?

 

[Sachphotography]

A skylight filter is pretty much just glass.. Nothing realy more than that. I use those to protect my lens from damages. A polarizing filter blocks reflected light. Read this
Timothy Edberg Photo Tip: Polarizing Filters
You can create some dramatic shots seem to pop and feel more vivid with a polarizer.

 

[kreuzberg]

Wow, that certainly makes the colours much more vivid. As nearly all of my pictures are taken outdoors I think its definitely worth the investment. I take it though I would have to take it off if I'm trying to capture reflections in things like water?

 

[Sachphotography]

Nope. you would simply rotate the filter and it would allow the reflections back. Get a circular polarizer for what you are looking to do. It would be a good investment for outdoors.