Some people asked me how i do my pictures with tablet pen. I use very few features of Photoshop - and one of them is layering. Here i will show how i use layers during the creation of the picture.
1st step: I make a dirty scetch of my future picture.
2nd step: When the scetch is finished i turn the opacity of this layer from 100% to 5-20% and create a new layer over it. It will be used for creation of more clean and detailed scetch. Each layer can be edited independently from the others.
3d Step: Final scetch is ready.
4d Step: After it we can turn the opacity of the scetch layer to 30-50% and create some new layers.
In the example shown here i use 5 layers for different zones. It makes me free to edit them without being afraid that whole picture will be corrupted. Here it was very usefull for me when i tried different colors for the sky.
Step 5: To obtain more realistic picture I add details.
More layers can make the creation of picture more easy (In this example i could make own layers for trees, mountains, houses) but a very large amount of layers will slow your work due to the problems of navigating around them.