You got this man! ;D
Values get so much more easier with experience and practice. You can really feel it get better each and every time.
If you wanna give yourself a challenge, throw in some color / color theory too and it gets even more complex.
Thats why studying values seperate is so much more effective. Start with easy forms like spheres, cubes, cylinders, cones and out of that you can pretty much simplify every object in existence and shade it like you would shade those simple forms.

Your drawing is a really really good foundation where you can pretty much see every form and go from there.

Quick tip: When you get lost in your drawing, try to throw in some flat colors at spots where there is a lot going on.
A lot of the foundation you already drew than gets set in stone and the cluttering gets buried underneath.
It's also a really good tool if you can't quite imagine your drawing in 3D (basically it doesn't look like it has any depth). Throwing in some really basic shading can get your brain in that 3D mindset.

Take it with a grain of salt, other than that I hope it helps at least a bit, everything depends on the person and their experience ;D

Nice work on the heads and the perspective! I don't have anything to add to what has already been said.
Keep at it

Nice work. I'm looking forward to the finished.
Where the tail is wrapped around the column, the volume should be similar in structure.
I'm not sure how to explain it correctly because English is not my native language. I drew a note for you, just like what Xybb did before.

Nice progress!
Amoresea has a really important point.
Right when the tail wraps around the column (or tucks behind it), it should be rounder, to emphasize its volume, right now it kinda looks flat and compressed, almost squished.
You would definitely notice it while shading, but right now it could be overlooked, so keep it in mind ^^.
I like the eye tower idea. Gives it some really creepy but interesting vibes.

The depth is also really good. More detail at the foreground and way less at the back, nice job!

Now that's improvement!
Good job dude. now it's all about practicing it more and more and you get better each and every time.

I’ve reviewed all of your photos and it’s just crazy how much you’ve improved over time. Thank you for inspiring me!