Nice start. I like the colours, and the water has a subtle flow to it.

There's a funny shadow artefact - a hard line along the top of the picture. Also, the shadows around the water's edge are a bit off. The top edge is fine, but the bottom edge seems to be casting a shadow onto the land. Finally, the tree trunks aren't reading quite right as there is foliage as well. I can't tell if the foliage is a canopy, and if so, why we see some canopy in some places but tree trunks only in others.

I love the level of detail in the textures, and the water is beautiful.