Fog does not fit into the map very well
The left lower side ought not to end in such a deadend-like fashion. You ought to make a little more looped...maybe make a small cave design underneath the right section to connect to the bottom lower left section.
Something for you to note. By now, there are so many fun and playable DM maps out there, that you have to make something that is not just playable, but distinctly unique. Otherwise, your maps will get throw into the "already been seen before" pile that no one really cares about.