Planning a drawing, more perspective

This is one of my direct study drawings which focused on planning, positioning and composition. It took me around 45 minutes. This drawing portray precis shape of both three objects. It also shows great form through the shading of the objects, especially the reflection on the electric kettle, it perfectly shows the texture. And the shadow between the three objects also perfectly shows the distance between each other. The background is much darker than the objects, it form a great contrast with them. The box is at left front, the roll at the right and the electric kettle is at the back, their position together and the contrast balanced the whole picture, formed composition. But I am quite disappointed with the shadow at the left that from the box and the electric kettle, because it seems little bit too dark and lost the relationship with the background, it looks like floating in the air.