Your arrows need more work! Try to add more curves to them, and be aware of the perspective (The Further point should be smaller)

What you missed on the arrows impacted your leaves. But your strokes are more confident there, so it makes it more convincing.

Your branches are great, but you need to be aware of the perspective and how it influences the degree of the ellipses. Every ellipse on your page has the same degree, but there should be variation.

I feel like some of your plants are lacking constructions lines. You represented the plants, for sure. But the exercise is about learning to build them, and I can't see some of the "building blocks", like the main leaf curve, or ellipse contour lines for spherical fruits (what would make them more 3D)

That said... Your demos are nice! You need to apply what you did in the demos for your own plants and you would achieve a much better "3D effect"