Indian Red is an interesting paint. It is the most opaque of any Daniel Smith watercolour I've used. It is best to use it without fiddling with it as the heavy pigment can be hard to control. What I love about it though is that it is the perfect colour for lips and the 'pink' of eyes in portraits, provided it is very diluted. It can also be used in mixes to paint the more red-toned skin. It is also lovely as an earth triad with Cerulean Chromium and Goethite for subdued paintings, and can be very useful for painting landscapes and rust.
Of my 15 palette colours, this is the one that is perhaps least used, but it completes the set of earth yellows (Goethite and Raw Umber), earth orange (Burnt Sienna) and earth Red (Indian Red) along with the earth blue Cerulean Chromium. An interesting earth green choice would be chromium green oxide but I would prefer Serpentine Genuine or Green Apatite Genuine.