What model camera is that from?

In normal daylight - almost any ISO will do. In general, keep the ISO as small as possible to avoid noisy images.

Something pretty easy to make the photos stand out alot more - is do a google search for "photo composition" or "rule of thirds".

In a couple of the shots you posted, the subject is nearly dead center of the frame. To the viewer, this is less pleasing than offseting it to one of the sides.

Also for landscapes (like the ones you posted) try and keep the f-stops "small". (f20 is smaller than f5.6)