Ima have to agree with The_Kozmonaut. You really need to step it some notches and really go to town on your work. Look into some tutorials on modeling high poly assets/whatever if you are interested of course. and always practice practice practice makes perfect....good luck!
That last part about "school work"... Until you stop thinking of it the same way you did math homework in high school you aren't going to succeed. It takes a ridiculous amount of passion, effort, and practice to get to a real professional level. If adding more to your scene is work for you and not something that you cant…