this pic looks like it is unfinshed the pic needs a bit more work on the color and shading. the thing i like about this pic is that the character kinda looks pretty cool and how he blends with the black background. i personally think that this character looks better without the hat.
i think u r getting better at drawing sonic characters now but i dont think your an exellent sonic artist yet. overall its an ok sonic drawing and the colors work togehter but i think u should of put more effort into this pic. all i have to say to u is that keep practising and then u will become a great sonic artist.
My first thought was, "A blue Tails with a hat and glasses.". Disregarding the technique, which is rough, this character lacks any sort of originality. I would try adding or subtracting some features to make it appear DIFFERENT from Tails, as opposed to to being a simple recolor. Now, regarding the technique, it could use a LOT of work. Firstly, you need to draw based on shapes, ESPECIALLY with characters like these. I would recommend you not draw these characters at all until you get a basic grasp of anatomy, lest you risk stunting yourself as an artist.
The best possible thing you can do for yourself is to study anatomy and draw from life. Also, you need to ditch the mouse for now and draw on paper or use a tablet. The lines on this are extremely choppy, and using a mouse is certainly a part of what's to blame for that.
Now, the colors. That blue is particularly saturated, and quite a bit obtrusive to the eyes. It could definitely do with a bit of desaturation, if not a moderate amount. Also, I understand that you're a new artist, but you should perhaps experiment with some shading (ON PAPER!) to get a grip on making objects appear 3-dimensional, because this comes off as very flat.
Stop worrying about style right now and try to learn some basic technique, as style is simply the artist's take on reality. It is ESSENTIAL to understand reality before you try to stylize it.
Um well I'm not tring to be mean here ok but his ears need more dental like the inside aswell as his sunglasses if you look at most sunglasses you can almost see there eyes and his frown. Or expression on his face the line is to long his face looks almost flat to and this dose into really matter becuse most sonic charicters are like this but his head is like the same sise as his body and I think his eye area is to small to some shading would Be nice to allso have you ever herd of layers there very helpfull in drawing but the drawing is very good sorry if I sounded mean I didn't mean to I just wanted to help but you are getting very good overall