Thanks.

Not sure if my exif is public. Still trying to get a hang on Flickr lol.
http://www.flickr.com/photos/84764600@N03/9668087085/meta/http://www.flickr.com/photos/84764600@N03/9668093997/meta/As mentioned, I use ProShot since the stock app is severely lacking in options and it looks like they want you to use lenses unlike how it was in WP7.
Using ISO 100 helps with keeping details as much possible since at higher values Nokia's algorithm tend to over-compensate and sharpness/details are lost, even if you can remove the noise in post-process. Obviously this is not always feasible, especially when dealing with low-light and moving objects. If you have one of those Gorilla tripod, it'll help a lot with taking night landscape since max shutter in ProShot is 4 sec. I don't have one, so I often have to settle with higher ISO.
I usually play around with Saturation and Contrast to get the mood I'm looking for. As for macro shots like the grass one, I use manual focus - usually at 5-10%. Nice bokeh.

I tend to under-expose my shots too, especially sunset/rise shots. Like the one above, I set the EV to -2 to keep highlight clipping as low as possible. For normal use, it usually hovers around -0.3 to -1. Hope that helps.
Lastly I'm just an amateur with no technical background unlike some of the gurus here so if you're looking for pro tips, you're probably better off asking them haha.
Currently I think there's a way to install Pro Cam on 512MB devices but you'll need Amber/GDR2 update for it to work. I have no experience with Pro Cam yet but from what I can see it's probably very similar in function with ProShot so you may want to hold your breath before spending any money on ProShot. ProShot does have some niceties though, like full-res timelapse function, real-time histogram, real-time level and grids but IMO they're just extras.