You've got some rasterization going on in areas of the diagonal lines, knowing you, they probably weren't intentional. Some of the overlapping of the pentool is also very strange( mainly just that middle stroke coming out of the left side, keeps making me squint my eyes.)
Other then that not much to complain about, nice mellow colours and a flowy atmosphere--very water like--it's soothing to look at. Maybe try for a more intricate background when you're back in your groove though because I know it can be difficult to do anything after a long break/slump.
*Gloomily looks at his list of to-do things* 