My favourite websites are art ones. A lot of them don’t have much in the way of tools. Often the drawing is already there and you just use a fill tool. They are boring. But I found a free app called Artrage oils which I used for several years till I got a new phone. Then I upgraded to Artrage which has a lot more tools, sketchbook app which has different tools and a few other ones that are good for editing, like photodirector. I now use them all in combination. It’s fun!