By chance I found on Youtube the channel of Buypainted. As it seems they run a painting commision studio, but I found interesting that they have a whole bunch of great tutorial videos hosted on Youtube.
Apart from the standard "how do I paint model XYZ" I really liked the "how do I make themed bases" series. So I thought: "Why not share with everyone?". And here it is:
I hope you like them as I do.
Stay tuned and enjoy your time.