I think the most useful thing for you to do at this stage is to learn how to shade and line more tidily and interestingly- get in control and understand what you're doing.
In regards to the shading, right now you are doing something called 'pillow shading' where you follow the lines- instead, try to draw something without doing any linework. Try to build the image up out of areas of light, dark and mid tone. This will help you understand shapes in a 3-d sense.
To help your line work I recommend working with some traditional media. Line width variation is good, but yours is untidy and a little all over the place. It makes it confusing for the reader to look at. You have to learn to make the lines emphasize the right features.
EG the line around his face/jaw/ear is very bold, heavy and the same width the whole way around, but for the wing you've used a very tiny little line- again the same width the whole way round.
If you can work with a real paintbrush, then you should. Try to go for one with long bristles. It may seem hard to control at first, but once you've learnt what marks it can make, you'll be able to apply the different kinds and weights of line to your digital drawing.
if traditional is not an option, get some kind of touch responsive tablet with pen pressure. It isn't as good as learning traditionally, but it will emulate the same kind of thing. Try to work at around 300dpi. It looks like you might be working at 72 for this. Find a brush setting you find hard to control at first, and then learn to use it.
The only other thing i can suggest right now is to make things more consistent/tidy.
By this i'm referring to the white on his jacket- i feel like this is meant to be shading, but because it's white (very high contrast, compared to the shading on his face, also) it looks a little like you didn't colour in tidily. The fact these lines are not as soft as the rest of the shading doesn't help either. The blocky way you've done the hearts/shadow on the ground also conflicts with everything else you've shaded in the image being soft. Try to keep it more consistant next time. : )
I hope that's all helpful to you, good luck!
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