Depends upon in what sense you mean "good". The postcards themselves are mainly standard views or greeting cards from the period, which are ordinarily worth pennies. I can't speak for the stamps or postmarks. The card of the men on horseback is the type that can attract more interest. Enjoy!
I should also note that on a lot of these coloured postcards, the colours were 'brushed' in. On some series of postcards I have come across will have the same exact image but the colours were brushed in to make it look either like day or night and in some instances clouds can be added to make it look like a storm may be approaching. From what I can see in here, the coloured cards in the hobby of deltiology would be referred to a 'colour litho cards'. Hope this helps?
The real photo of the people on horseback is by far the most interesting and most valuable of the group. It is postmarked at General Grant National Park, CA, (post office open 1910 -1940) now known as General Grant Grove within the larger Kings Canyon National Park.
3193zd, when ever did you hear a boy called Marion. Some change allright! Oh yes, 1911 to now, things sure have changed. She must want to buy a postcard and stamp to mail it back to Mama so she could have it for her postcard collection!