There are some excellent photos in this portfolio, bravo. You certainly don't need any lessons from anyone, but I will gladly answer a question that you just raised elsewhere which is where one points a bounce flash? It's depends simply where you want the light to fall, it changes every time. Best wishes, John
.. trial and error, that is the disadvantage of the technique, sometime less, sometimes more .. a little experience does often help to project what is needed though .. in principle, the stronger the light from the window, the less flash needed .. the exception being when the situation is very contrasted and you neeed to neutralize that.