I've drawn a still life thingy.
It's good, and I like how you're selling the transparency of the bottle, but the other things need work or are sloppy.
For example, the tin of whatevers has this really strange reflection in the middle of it that I don't really know what to make of. Is it even a reflection? That stripey thing. If it is, it could do with some smoothing out.
The shadow that the tin makes is super harsh and would only really be seen in life if you had cast a spotlight on it - you need to lighten the shade of the shadow and blur its borders according to the real shadow. Even if it looks that harsh to you, unless you intend it to look like a noir movie I suggest dampening many of the contrasts. I did that mistake a lot in my past, and it makes drawings hard to look at.
That blackish background is sloppy. Is that the table edge there, or did you just decide to drag your pencil out there? If it is a table edge, it'd have been nicer if a few of the objects in the background showed through, or if you showed a bit of how the wall looked like. It doesn't even have to be detailed - just blur it out like a camera focus would. Point is, the ragged edges make this look like you gave up halfway through and don't contribute to the success of the still life.
You left the table blank, but you could've applied some texture or at least given us a rough idea of the shade - unless that table really is uniform and blinding white. It's not really a good idea to leave large portions of the canvas blank.
No shadow on eraser. No ambient occlusion (video game term, I know, but it's my best term for that subtle darkening around contact points between two objects).
What's that thing on top of the lid? A peanut?
Eraser is sloppy. Unless it's a new eraser, you could have told us a little more about its eraseriness and its character by rounding off the edges and illustrating some of its dents, marks and whatnot. Maybe you don't need to go that far - but right now, it's just an oblong shape that's hard to identify.
You should also work a little more on getting that shading evened out. You could try using a lighter touch or smoother paper, or one of the multitude of tricks available - paper tissue, tortillon, light use of kneaded eraser, etc. A still life's subject won't run away or go to the bathroom, so you have plenty of time to do it or leave and come back.
Oh, and by the way, is that cough syrup?