You've posted a lot of stuff here so you probably won't get any focused feedback. My suggestion would be to put focus on one thing, maybe work through ctrlpaint.com and also to draw from reference. Good luck, have fun.
Yes. There are several little mistakes all over different subjects. Focus on one thing at a time. I recommend perspective drawing until you master it, then move to other subjects.
The best advice I've ever gotten was "spend more time." You're doing a ton of fast doodles but slow it down a bit and spend 30+ hours on one piece. Find 10 images online made by pros and try your hardest to hit that level of quality in your 1 image. Right now you're rushing and it shows which makes it hard to give detailed advice that would take longer to explain/draw over than it did for you to draw the original image.
Hi iam a college student and i want ur opion
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You say you want our opinion, but our opinion on what exactly?
on every thing thank u