I think they are in focus, but the depth of field is tiny
or is could be the kit lens, either way they are soft.
also the colour contrast is very high, tweaked to this effect? I thought I was looking at fuji digital photos
long exposure on the streams can look really good but you've picked a subject with lots of foliage in frame, if there's any wind then this blurrs the whole border out, which means that your nice flowing etheral water motion doesn't look starkly different to the wafting blurring flora, which is tricky
I'm a amateur 350D owner too but there's nothing going for me really
the one on the stairs though, if you took a tripod and played with HDR or and infrared exposure, that could make it a lot more dynamic, just my tuppence