Reddit mentions of Alvin, TD1267, Even Ellipse Master Template, 6.5" x 11" x .030"

It's great that you've been practicing these for a couple months already and overall I'd say the main area to focus on should be getting that consistent ellipse form with a smooth round end and a subtle curve on the sides. Some of your ellipses are flattened on the ends and some others lose that curve and become straight on the sides instead of subtly curved. This is all expected when starting out and to really get good at ellipses it'll take months upon months of regular practice.

The upper 3 columns are your strongest for sure so what I'm saying about shape mostly pertains to the lower 3. Also in some areas watch for the minor axis moving off course - if you aren't rotating the page slightly as you move down this will naturally happen.

To nail down the the shape just keep practicing but also I think buying an ellipse guide like this https://www.amazon.com/Alvin-TD1267-Ellipse-Master-Template/dp/B000KNPX2M/ref=sr_1_2?keywords=ellipse+template&qid=1566888566&s=office-products&sr=1-2 or even printing off your own the use as a reference will really help. When doing the rows of ellipses exercise for example I'd pick a degree that I struggle with (your small degrees look better so try going larger like 30-70 degrees) draw one of the template ellipses (or just trace from a printed sheet) as your first ellipse at the start of each row. When you're working then you can compare your ellipses to the example and see what's off.

Lastly, thinking of drawing ellipses as a set of distinct yet interdependent skills helps assessing the quality objectively so I'd suggest breaking it down into these skills when setting goals and doing specific exercises:

Skill 1) Drawing a true ellipse shape: i.e. looks like what you'd see from an ellipse template - not too flat ontop/bottom, ends are round not a sharp point, no symmetry issues). Smaller degrees tend to be easier to do wellI find but the closer you get to a circle the harder it is to do well, especially when larger than an inch or two.

Skill 2) Placement pt1: aligning the minor axis. If you're drawing a correct ellipse shape (1) then you can easily tellif your ellipses are aligned by finding the major axis (end to end) and see if the perpendicular is lining up.

Skill 3) Placement pt2: getting the degree right. This take experience placing ellipses inside of squares andknowledge of perspective grids which I won't get into here but to actually use them this final step along with (1)and (2) will make your ellipses usable in perspective drawings. Your exercise here doesn't cover it but others can.

Skill 4) Line quality: I put this last since it's something you always will want but it takes tons of repetition and timeto do clean ellipses again especially true for larger ellipses with a larger degree. For the most part just keep this in mind and gradually work to improve over time w/o letting this get in the way for everything else

Scott Robertson: How to Draw? Great book if so :)

Yeah, the ellipse templates are very expensive, $110 US for a set of small for me, almost $200 for large. Same with the equal space divider I saw him use in one of his videos. I found one for $300 lol (didn't buy it).

Sweeps are quite pricey for what they are too imo. The only place I know is a UK site here, but they're called 'curves' or 'french curves' rather than sweeps. Maybe searching for those terms instead would help.

Like I say though, the ellipses are helpful, but not necessary. You can do the grid plotting with ellipses exercises digitally and save yourself a good $100 - $200. Most grid building in the book doesn't use them, and once you learn what a cube looks like, you can do it without anyway. I used them for maybe 1 week out of the 6 months I spent with the book.

The oval template you're looking at is only for 45 degree ellipses. It might get you in to a habit of drawing the same grid over and over again, which sort of defeats the objective of the book. Its philosophy is lots of different types of grids where you have full control over what they're made up of.

Alternatively, what about something like this, or maybe this.

If you got both, you wouldn't need your ovals anymore (they're 45 degrees), and you'd have 60, 45, 50, 40, 35, 30, 25, 20. Not a full set of 15 but pretty darn close for about $15. They'd be quite small on the page though, but probably enough to learn with.

Edit - $15 for this one. Even more selection. I think that's about as close as it'll get to a full set. These are small compared to the ones linked above though. I think I'd prefer the ones above even though you lose the 55, and 15.