i think it looks good. I like how your coastlines look.

3. You don't get big stretches of mountain the way your have on the western continent. It just doesn't happen.
This map doesn't represent earth and it is much smaller so I dont see any reason why there can't be a long stretch of mountains? The appalachian mountains range from Newfoundland all the way to Alabama in a pretty straight line. over 1600 miles.