Another app that I am trialling is UPAD
I am using the lite version of this app and I am very impressed. I like the cartoony look, which is very easy to achieve. Everything is created in vector format, and the selection tool makes it easy to copy and paste parts of a drawing. You can also resize the selected items, as I did here with the palm tree. Although I’ve not used any here, the app is very good for adding hand written text, which is smoothed very nicely. You can zoom to 800% which makes it easy to add any amount of fine detail.