Not too bad. Props to you for posting something of the bat. Repped! Also for critique I'd say there's a decent amount of artifacting or pixelation if you will on the map, especially the shore looks a little blocky. For the on land pixelation you may wanna try some smoothing effects i.e Gaussian blurring with low pixel count or even using a low opacity pencil or brush to stroke over the area maybe singling them out by color and using a low opacity fill as well. You can try a maybe using a layer mask to make the shore less jagged.
P.S. Is this the full resolution?