I see some purple color fringing on the bench shot; that might be correctable in Lightroom under chromatic aberration reduction. I see some less-than-ideal lens performance that looks like tyou might have a low-quality "protection" filter on the lens; if you do,m ditch that filter. There's an overall softness to some of these that looks like a less-than-ideal telephoto zoom lens, or maybe the filter. The longest focal lengths in many 55-250 or 70-300 zooms can look like this, as if the shot had been shot through less-than-clear glass,
In general, these are more-focused,selective,simple images than many beginners tend to show,and I think that's good. Youe color in the one blue sky shot is sort of odd on the sky coloration, too yellow-y in the blues and overall. I think you're getting to a place where you can "See a picture", and can reduce the elements shown to a level where the picture comes out. photography is the art of exclusion, of eliminating extraneous stuff in the photo, and you;re doing okay with that for the most part. Each of these shots shows the viewer a simple subject, and is mostly stripped down to the bare essence, and that is a good thing. You are on the right track!