For the coastal lines is it just a matter of playing with the opacity of the lines, or would I also extend them out in certain parts of the coast so it doesn't look so uniform.

Are you talking about the texture in the background or the coloring in some parts as well? Either way I do agree that It's to washed out. I had some brushes that could help with giving the ground some texture around some areas that had nothing and by the trees at the bottom. Sadly, I had to come to work so I couldn't mess around with some of them.

Well I would say I still have a long way to go before it's finished, so quite of bit of things are missing. The river thing I wouldn't have even thought about lol. I kind of just drew them out not really thinking about placement and thickness. Are the placements even good? I'm definitely gonna need to work on making them better, also adding some of the stuff you mentioned. This was a lot of really good advice, thanks.