lil advice please

[Liquid yellow 182]

Can anyone tell me why my pics came out a lil grainy? ISO was 800 F5.6 shutter 1/15. photobucket made quality bit crap on thread but when I view them on my laptop they still seem slightly grainy. cheers.
http://www.cliosport.net/forum/showthread.php?553205-First-snaps-on-2011-LY-content

 

[Adam.]

Looks fine!

Get a flickr account, it doesnt kill the quality.

 

[Andy.]

Depends on the camera, but ISO800 is guaranteed grain on some of the older ones. Some look slightly underexposed too, but it could just be my iPhone.

 

[Liquid yellow 182]

Lower the ISO the clearer image right? but higher ISO gives more light but makes it grainy

 

[Craigus]

What timne of day did you take them?

 

[Ay Ay Ron]

Lower ISO and longer exposure (with a tripod) might help?

 

[dunganick]

They look fine to me considering the Host. The first is miss focused, slightly back i think (difficult to tell thats how slight it is) You can only tell as the numberplate isn't pin sharp, which on cars is 9/10 times what i seem to use to judge if a car photo is sharp or not.

For images your going to use online sharpening will help without negatively effecting the image, also a lift in contrast will make images appear sharper/better defined. The images are quite flat at the moment, so this might help. There isn't much noise in these images, as i would expect at ISO800 from a 400d.