The first thing I noticed is that you have fraying on both ends of your lines in the first exercise. The placement of the beginning of the line should be specific and on a single dot. I'm also seeing some arching in your lines, which may indicate you aren't using the shoulder pivot. In the plotted and rough perspectives you are repeating your lines. If you are trying to increase the lineweight for the boxes, the lines should only be repeated on the outside perimeter of the box, and the lines should be ghosted with the intent to overlap. Some of the lines in your rough perspective look a bit rushed.

There is a little bit of an issue with getting the accuracy of your ellipses down, but this is a common issue and will improve with practice. You've got the confidence and smoothness down which is key. The lines of your minor axis aren't splitting the funnels directly in half, although they are pretty close in most cases. I'd also recommend using a round object like a bowl to make the curving guide lines for the funnels. Here it looks like you might have freehanded them?