Well I'm still learning the whole thing myself as I'm pretty new to producing. But maybe you have too much compression on your kicks in "Piano 1". They just dont sound powerful enough to me. But thats just my opinion.
Like I said I'm learning myself, so whatever I suggest you should do the opposite lol!
for some reason i could only listen to piano 1. not shit, just sounds underdeveloped. more like an idea than a track. you need more layers (fx, pad, more drum layers), and you need to progress the track more. keep it up, not shit at all...
thumbs up for the dubstep tune, the first drop is niiiice
for the dnb tune, the drums have a drive but as others said mixing must be improved
your right the limiting is a bit too strong
what did you do with the equalizer?