Marián has left us in a comment a very interesting fact: his blog. In it, he tells step by step everything he is doing to create children's illustrations for a story that is currently in the making.
I know that it is a bit far from the entire digital world in which we move, but the imagination taken to the real world without a screen in between is sometimes much more incredible and rewarding than the one we create with the tablet and keyboard, so I can't do anything other than recommend that you follow Marián's progress.
A lot of work, a lot of dedication and a lot of desire to tell us everything we need to know about illustrationn. People like Marián make learning and understanding so much easier.
Link | The Prussian Blue Cat