alright, ill say that the linework is clean, not a bad little drawing
now, to point out some things. first off, that drawing isnt realistic in the least, its very much anime, there are a few things anatomically incorrect with it, most are minor, but the arms are a big one, theyre much too short.
other things i notice wrong or poorly drawn are:
pants, the shape doesnt look like right in general, the folds are off, the cuffs are the worst part, second on the list of worst to best is those knobby ass knees and the way the cloth is around them, look at some reference and take note of how pants of differing tight/looseness fall around the legs, study it, draw it, get better, $$$.
the feet....i dont really have to say it do i? it looks like you just gave up more and more the lower on his body you get.
last but not least, while the torso portion of the shirt is drawn well, the sleeves are not, again folds and cuff are badly done. and again, reference.
and a few minor things, pockets are too narrowly spaced. what i assume is the button (if thats a button) is in the wrong spot, it would be behind the belt thus not drawn at all, and also it would be centered above the fly. the hands could use work, his right (your left) is drawn better but still could use improvements. his collar, doesnt have a part where it buttons down, dont know if this is on purpose, but im just throwing out things i notice.
also the belt is off center, but i assume you drew it that way on purpose.
all in all, not bad, but needs some polishing, i think the biggest thing you could do to improve is to draw from life. study reality. and some words of wisdom an old art teacher i had many many years ago said. "draw what you see, not what you think you see" Mrs. Nelson. and if you take its meaning and apply it to your art, i think youll take note that you tend to do a lot of drawing what you think you see.
long post, sorry, but take from it what you can, im not trying to rip your drawing appart and talk down to you or anything, just trying to help a budding artist improve.