Hello Cpinzon my name is trollfromhell and i am gonna give u my critiques if your lesson 1

1.Lines

your super imposed lines are fraying on both ends,u should know that when u stroke ur lines u must use ghosting method so you will hit it with better accuracy,fraying is only acceptable at the far end

-your ghosted lines are good

2.elipses in the planes

when you draw through elipses twice make sure u keep the lines close together so they will look clean

3.tables of elipses

u need to ghost your elipses before u draw them,just like u ghost straight lines with your shoulder u also draw elipses with your shoulder too also if needed rotate the paper to draw elipses

4.funnels

the minor axis (the line in the middle) should cut ellipses in 2 symetrical halves.

5.plotted perspective

you should put darker lines for shadow but other than it looks clean and neat

6.rough perspective

your lines should be parallel to horizon and height lines perpendicular to horizon,make sure they are 90 degree whether they are horizontal or vertical lines of your boxes,put dots to draw the face of the box

7.rotated boxes

they are okay and i think you will learn more in 250 boxes exercise 

8.organic perspective

keep the size of your boxes like cube from smaller becoming bigger i reccomend u to strart drawing with Y rather than any angle