Do you like it? That's the thing, liking something enough to spend hours at it.
I think maybe you're better than you think. I'd suggest when you're out taking pictures like the tree, move around and look at the subject from slightly different vantage points and think about how you're framing. I see what you were going for and for me didn't quite nail it but it's close. The balance of the composition is what probably needed to be a little different. Think about the lines and shapes, the tree trunk is a large vertical shape and needs to be balanced with the rest of the image (and that top left corner bugs me, I'd rather see more space there or none, my instinct is to want to take a step to the left).
I do that, roam a bit and keep reframing and looking thru the viewfinder and then I see 'it' - the picture. Sometimes I can't quite get it, roam around some more, maybe take pictures of something else, then I'll turn and see it, what I couldn't get before, it's like the light bulb goes on. I've been a photographer forever so by now it just seems second nature and when I see the shot, I know it. But it's really from years and year of taking pictures.
Seems to me if you learned more about composition, you're on the right track. Such as IUNoir, great seeing something interesting, but there are almost two pictures there, the kiosk and the right side with the bikes and the curved lines going off to the right. Nice potential there for a number of different photos actually, and the good thing is you're seeing that, now it's a matter of continuing to practice and learn.
With the portrait, I'd make sure if there are lines in the background like with this brick, think about either getting the lines straight, or if you go for an angle think about how to frame it. And how much space is best, to the left of her, how much of her to have in the frame, The B&W from the back works because of the hat and the head turned to the left, but with this one it's necessary to notice the background. It takes practice to get so you can frame a subject and keep the background in your peripheral vision and keep an eye on other people moving in and out of a scene. I got so I can shoot with both eyes open and close my eye long enough to focus//shoot. But I didn't exactly get to that point overnight.
I like spiky ball, that has great texture, and I'd keep working on that one, set it up a bunch of times and see what you can get. Maybe the ball a little closer to the doorway? And notice the pattern in the floorboard that's in the center bottom of the picture, that adds texture and interest so think about how to work that into your composition. That and the shadow of the ball, do we want to see all of that? part of it? Maybe adjust the contrast in B&W too a little.
I agree the first one's really nice. Whether you know it or not you seem to have an eye for pattern and texture. I'd think about a very slight crop of that one, the right side where there's a faint edge of the wall, same with the top and the ceiling. Which is getting nit picky but it would 'clean up' the composition.
Didn't mean to go on so long but I got really into looking at these. I feel like I see what you were going for with all of these and if you keep at it you could keep getting better and better at framing and composing. I see potential in you.