I find that your main problems with your maps are that, for indoors, they are too big and empty. You need the make the maps smaller, and fill it up. Use a variety of the tiles, it'll give it a better affect. Your out door maps, are not too bad. They are very empty for an outdoor map. Try putting random shit everywhere, in a nice fasion though.
Sorry if my two cents aren't too great... its not really what I do best xD.