..Now there is in the South of Belgium, in Hainault, in the neighborhood of Mons.. ..a district called the Borinage, that has a peculiar population o… - Vincent van Gogh

What a mistake Parisians make in not having a palate for crude things, for Monticellis, for common earthenware. But there, one most not lose heart because Utopia is not coming true. It is only that what I learned in Paris is leaving me, and I am returning to the ideas I had in the country before I knew the impressionists. And I should not be surprised if the impressionists soon find fault with my way of working, for it has been fertilized by Delacroix’s ideas rather than by theirs. Because instead of trying to reproduce exactly what I have before my eyes, I use colour more arbitrarily, in order to express myself forcibly. Well, let that be, as far as theory goes, but I’m going to give you an example of what I mean.

It is true, however, that first impressions often change, for we know only too well that all is not gold that glitters and that though there may be a bright dawn, there is also a dark midnight and a burning, oppressive heat at noon.

Now, I'm going through a similar period of struggle and despondency, of patience and impatience, of hope and desolation. But I must plod on and anyway, after a while I'll understand more about making watercolours.
If it were that easy, one wouldn't take any pleasure in it. And it's exactly the same with painting.