Wet on Wet technique is were it's at, super fun & messy but some how always turns out awesome. You want lots of water her don't be afraid to pick up the paper to move the colour around & work quick. Then PUT IT DOWN & DON'T TOUCH IT! Let transform as it drys go get a cuppa, i mean it DON'T TOUCH IT
Creating depth & perspective with simple silhouettes & highlight make a big difference.
Practice different tree shapes to find your favourite tree.