>>1792368
Lol what an attitude. If you think 30 minute scribbles are adequate to learn the intricacies of Sargent then you need to think again. I think you should spend at least an hour on it, but if you spend closer to 4 or 5 you are even better off (although obviously not every study will be that long). You need to slow down instead of trying to hit that timelimit. You think Jaime or Mullins or Sargent painted quickly? Nope. They all have a very slow method. Watch Mullins' Gnomon vid, read up on Jaime's posts and what students have said about his demos, read the Sargent Notes.
And while Sargent did have loose brushwork, his shapes and strokes were NEVER sloppy. They were highly calculated and very intentional, which is something I am not seeing in your study.
Based on the brushwork and your attitude, I am guessing you are that kid who's been posting his sketches around pretending to be Jaime and stuff for laughs. Even if you aren't that guy, the study shows me well enough your level, and it tells me you aren't professional yet. I've seen enough art and seen enough people develop over time that I have a decent idea of where you are and how long it will take you to turn pro. I say at LEAST 2 years before you are getting any jobs worth anything, and even then they probably won't be a steady stream. With a change in your attitude, ideal training, and a very high volume of effort on your part, you can be very good in around 3 years or so...but honestly the chances that you will do all that is slim.
Sorry if I'm sounding negative, I'm just trying to get you to see things more realistically. I am at a higher level than you and work professionally, and I'm not making much money or getting many good paying jobs.