The ratio if shaving cream to glue is tricky. If you have too much shaving cream and not enough glue, it won't dry well. If you have too much glue and not enough shaving cream it won't get good lift. You just have to play with it. We added the color with a dab of tempera paint. Sorry I'm not very exact with the ingredients. We tend to be a fly by the seat of our pants kind of family and frankly, I am no good with recipes. Just know you need way more shaving cream than you do glue. So maybe a table spoon of glue for every half a cup on shaving cream. If doesn't seem fluffy enough than add a bit more shaving cream. That is about as exact as I can get it.
One of the things I love about puffy paint is that you don't have to just limit yourself to a paint brush. You could use a knife, a spoon...
...Or your hands!
Here is another masterpiece.
This is her final piece, where she unloaded every last blob of puffy paint on to the paper. This does take a while to dry so find a place you can set this with out being in the way, but it is one lovely way to spend an afternoon!