The tiles are wonderful -- I love the swamp -- and the tones you pick bring in a sort of "painted universe" that fits well with fantasy settings. I'm surprised by the "squarish" look of some of them when transitions are missing.
Within the tree on the left, for instance, you bring in some variations in colours, but it looks like each tile must have a unique palette and the transition between brown and green leaves becomes a straight line. If that's technically possible, I'd have built the tree with layers that have more organic shapes so that the brown-to-yellow and yellow-to-green transitions drawn an organic curve as well.
There could be some readability issues with desaturated-sprites-on-desaturated-bg, but since it's a bit hard to see which tiles are meant to be walkable and which tiles are meant to be "walls" right now, I can't check whether it actually happens.
Regarding the portraits, they have a nice 14(?)-century look that also fits the theme well. However, they tended to depict women as pitiful souls praying for mercy ... which somehow appears in your leftmost portrait as well. If she's a major character, I'd have expected her to be more determined. Whether it can be done with eyes alone or the pose itself needs to be changed ... well, I'm unfortunately not skilled enough to tell.