I like it.I'm into modern buildings too,i recently made a house and a hotel.If you want an advice here it is:Look for insipiration on google images,searching for "modern houses" etc.The results can be pretty good c:
Edit: As Fille_Swe said,try to use another texture pack,i'm using one which is really good for modern buildings,here's the link if you want to see it (it's not mine) http://www.minecraftforum.net/topic/824150-64x132-soartex-fanver-hd-smooth-texture-pack/

Im sorry man :/ This looks like crap