One should not deny one's desires in what we create, if sunshine is a part of your soul then a dark rainy landscape will not do, for your soul wasn't in it and that missing ingredient subtracts much from the image. I've liked much of your work, so keep doing it as you always have . But if you do want to try it... I've come to the conclusion we both love Patrick Rothfuss' The Kingkiller Chronicle. I loved the night themed Felurian image. So maybe you can re-read Chapter 91 of The Wise Man's Fear. The towering oak and the encampment. Maybe you can't create a dark day by yourself but inspiring yourself from the writings of a book may just do the trick... Anyway there are many other rainy scenes in that book and many others (the towering oak and the encampment may be to radical to start with ). Best regards! Keep up the awesome!