The biggest thing that stands out with your boxes is that you seem to make one specific corner converge a lot faster than the other ones, such as on 78 where the left front corner does just that, same for 46. some of your corners also converge in opposite directions, like how the red converging lines on 43 are doing that, you wanna make sure all your lines converge together towards one another to the same vanishing point. Make sure to add line weight aswell as you pointed out you forgot to do, Otherwise, keep at it!