Pencil Sketch of a glass of water/wine-object drawing-showing the process step by step

So i have been thinking about drawing a realistic photo.
i have never tried but i see people starts with object drawing.
realistic drawing is hard and for a newbie like me its super freaking hard.
in a realistic drawing you need to be very careful about the shading.
there are supposed to be a lots of different color variations.
and in black and white its really hard to keep track of them.
if you mess up with the shading and the deepness of the color then the drawing won't be looking very realistic.
thats why a realistic drawing takes a lots of time,
but as a beginner i think i should start with smaller things and with small amount of time.
so i drew a glass of water or wine(the confusion is because its a pencil drawing. but i think its wine because of the glass shape and style.

so here it is:

of course as usual i took shots of the process:

so that was it.
it actually took a very long time, probably because i am new at this.
i used hb,2b and 10b wooden pencil on normal art paper.
i didn't finish the whole glass because i thought i should take it slow.
if i try to do all of it may be it won't look very good.

let me know what you think about this in the comment.

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