the waveforms that soundcloud display are not what the original upload looked like in the editor on the ops' machine - they modify them by analysing the file and generating a normalised view, accentuating the overall level of the track
in addition, a waveform of this nature should never be used an indication that something needs compressing or limiting - only your ears can tell you that (and maybe your actual Peak Program Meters in your daw)
the only thing that I might take away from these waveforms is that there is lot going on