Normally there is a gallery at http://www.EricEdmeades.com with a few of my pics but it appears to be offline at the moment.
Yes, a bit nervous at times. And while a horse can do a relatively good job of 'getting away', it is (a) concerned with thorn trees/shrubs that rhinos run straight through and (b) not concerned with low hanging branches etc.
Much more nerve testing, however, have been my encounters with rhino on foot. I have been charged by rhinos (and other beasts) while on foot a few times and that sure does get the heart going!