I really like what you did with the light coming through the leaves on the fox. But I think you took it a step too far. The saturation of the orange is too high. The composition would be much more beautiful if you lowered it so you could concentrate on the landscape better.
The dappled light is somehow on the fox, but not on the leaves, tree trunk or most of the grass underneath.
It's virtually impossible to figure out where the light is coming from. The valley bottom seems lit, but there are no shadows on the clouds or from the clouds, and the mountains on both sides of the valley seem to be in shadow. (Convert the picture to black and white and see for yourself.)
I wanted the fox to be the focus of the picture, which is why it's so high. I think if I did lower the saturation, I'd also have to add a lot more to the landscape, which is perfectly fine because it's pretty boring anyways. Thank you so much for the help! I won't be editing this but I will keep this information in mind for the next time I draw.
Yeah, I messed up the lighting really bad, I hadn't even considered it until long after I had finished. Next time I'll try making my pictures black and white to make sure everything looks okay, as you suggested. Thank you so much for the help!
Adding to what has been said, you're also missing reflected light. If the light is so strong that you get this sort of dappled light effect (which you don't get with an overcast sky), there'll be lots of reflected light in the shadows. On the fox, on the tree, on the fance, everywhere. It wouldn't be this dark, nor this desaturated.