Hello fellow musescore enjoyer. First off, impressive cello quartet compositions. A few tips of advice though, your melodies often felt like they were random (not necessarily) but they weren't catchy. It would have been nicer if you could have further elaborated on the different motifs in your composition. Second, musescore is great for composing music but not good for producing it. To produce music for other's ears, you'll have to export the midi file from musescore to a daw such as (lmms, reaper, ardour, cakewalk, etc [free ones]) and use vsts to get a better sound. Occasionally the cellos would play a whole note and you could hear the unintentional tremolo and clashing between them. This is really just a problem with the instrument quality (soundfonts). Most soundfonts can't really compare to a decent vst. I recommend looking into this stuff.