Small hills in immediate vicinity of player forts are a bad idea, and the bottom left firedrake is placed outside the map.
Stays the same as original map
the volcano theme is a good idea, however i'd wish you placed trees more naturally and picked different mordor objects/rocks to make it feel more immersive (such as orc tents creating villages, more darkrocks, etc)
Map Design: 2
Textures need a lot of work, however I appreciate that you are trying to use multiple textures. What I don't appreciate though is hot lava mountains :( not realistic, and the mirkwood textures/trees really don't fit the volcano theme. Is this is your first map?
Additional Comments: Good idea but medium-bad implementation. However if it is your first map, it's not bad at all. Take a look at how EA maps do the texturing and try to apply that to your maps, atleast until you learn how to do it :) Mountdoom is a great volcano map example.