Hi,
I'm not too familiar with the SD but looking at those shots they're exactly what to be expected with shooting in those conditions. Not a fault of the camera, you just need to play around with it some more and learn the other modes. Its not a big deal lots of times people assume that the Auto setting is smarter than it actually is, sadly it isnt.
You said you have the M on your dial thats full manual mode, you'll run into the same problems with manual mode. Leave that for when you get around to mastering the other modes, check out all the scene modes take tons of photos with them so you can see what the results will look like. Note not all of them are going to work out, just use them so you get an idea of what to expect with them. Also check out the manual on the section on shooting modes, it give pretty good information on what they all do.
Sunsets are typically low light shots, as stated before even the most exensive cameras need light to get a good shot off. Try this for a test, dont worrry about getting a perfect shot from your roof just try this looking out a window. Set the camera on a solid surface (table, window edge etc..) Use the 2 second self timer option, and shoot a shot in Auto mode. Now try the same shot with different WB settings so you can see what changes in color are made by different settings, also try the Vivid mode so you can see how the colors are boosted for sunsets. When you're done with figure out if you like the Vivid mode for sunsets and what WB setting looked the best. Now try taking the shot with different scene modes and see how they look differently.
Part of the joy / pain (depending on how you look at it) with digital cameras is playing around with the settings and figuring out what the beast can do.
Regarding what you see on the screen isn't always a true representation of what your going to see on a print. In other words looking at something at full zoom on your computer screen would be like putting your print under the microscope (ok not that much but you get what I mean). Printing all that information on a standard size print tends to smooth out and at times clean up the image.
Remember its a digital your not paying for film so take a 100 shots of the subject if you want its doest cost you anything.
Ed
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A95 Gallery
http://www.pbase.com/eddyb/a95