Igloos too small. Habitats (huts, farms, buildings, igloos, yurts, etc - should look like the... people?... Or what ever species lives there can actually live there.
Boat. yeah you heard. Trees... I don't know. Not my first choice but hey not my map. I would, however, suggest killing a few trees close to their base use one tile of blight to "kill" it. You most likely will have to go back with other texture to fix the surrounding area - leaving only the single tile of blight(covered by a stone, dead weeds, log, whatever). Forests usually have some dead trees it is the cycle of life - along with that make a customized copy, shrink it down to make "seedlings". Might also want to vary the height of trees more making a more "realistic" natural feel.
Variety of tree would also help - throw in a few cityscape "tall" pine trees, and maybe a few northrend "winter" canopy trees.
Cattails, rushes, river/stream/water plants. Those usually grow along side a semi-deep water way - assume 1 the flow of water (usually down the middle) will take out plants. Assume 2 that the water is deeper at the center. When using the cattails you should also use the rushes (not the cattail looking rush, the grass like ones). Clump together making a kind of thickish grouping - cattails do not grow as individuals too far from the pack - they grow close together in nature.
General rule of thumb is that a gorge or step sided stream bank has a fast moving "cutting" stream - rocks and boulders in the middle ok, light or floating stuff not ok - unless "trapped" behind rocks or fallen logs. Plants in the middle not ok - it sends a mixed message on the stream flow feeling artificial since the mind will picture fast moving water with steep sides.
Is this late fall or early spring? I'm slightly confused. Your pines are dark - telling me its fall, yet you have a lot of spring flowers, green shrubbery and what not.
If late fall use more brown plants. You can customize shrubs and get yellowish brownish tints - you can also mix wheat with the brown rushes - all of it looks dead, dry and that the little bit of snow is the first snow of the season.
If it is spring then use greens - you can customize rushes and get wonderful shades of green. Lighten up the pines giving the color hint that spring has sprung and that things are coming back to life. Using those your map gets the feel that this is early spring or a late snow in spring.
Lily pads should not be used in either case. Lilly pads are late spring to early fall growth, growing brownish black near winter, breaking off and sinking. And do not "feel right" considering the feeling of fast moving water due to the steepness of the stream/river banks.