Map could use some smoothing because there are a lot of parts that are jagged when they should be smooth & the lighting for the majority of the map needs to be tweaked because the lighting suggests it's day time rather than night. Apart from that, nice stuff!

i think this map has a future if you are willing enough to dedicate some hours to it. personally i use some pictures that i can find on google to help me you know see what i am making like the theme into a image. for example i am making a snow themed map i see some snow themed images etc.
i hope it helped you a bit , good luck with your map.