I like this for many reasons, i also dislike it for many reasons.
You have a good balance of lights and darks and my eyes are guided through the scales of the dragon. While looking at the piece i can (somewhat) distinguish it is indeed a dragon. it just takes some time to pick out the details.
A few things you should look into improving are definately anatomy. Dragons are difficult and there is a book out there specifically for drawing dragons. Fantasy drawings like this take lots of practice and are very difficult to get good at. Simply because the only way to get the forms and anatomy right is to basically create clay sculptures.
I noticed how you let the dragon get smaller in size as it approaches the background i liked this. I feel like you should use a wider pallette of greys as i don't see many different tones of grey. You seem to kinda focus around one kind of light and dark but there really is no strong intense depth going on.
For the most part its pretty good. Try to capture the darkest darks and the lightest lights. Keep your transitions smooth and remember not to let the paper get all dusty and dirty looking. While you work don't let your hands get everywhere, it gives an effect on the finished product that isn't so nice.
Also. Do some still life studies of objects, simple objects and just try to capture their likeness. Go on the internet and look up drawing tutorials and do them, you will learn how to make your drawings gain form and look more natural.