this is my first mess around please let me know what do i need to improve
lens is 18mm-55mm and shoot with 6400 iso , manual mode , ranging 1/10-1/30 f5-f8
Because you're new, you might not know where to post for critique. This section is usually for general discussion, not for individual photo critique. There are many Photo Galleries where you can post images for critique:
Photography Forum In your title, you said these are landscape, though they're not really landscapes. There is a "Landscape and Cityscape" gallery, and if you're not really sure how to categorize them, you can put them in the "General" gallery.
As for the images, others have mentioned some technical details that are useful. I'd like to suggest that you pay attention to background. When taking pictures of your car, for example, you might only notice your car, since that is the subject you are interesting in capturing. However, someone just looking at the photo is going to notice that there's a busy, fairly uninteresting background, and that is going to take attention away from the car. The lower perspective on the car is good, though. You might want to check out some of the threads in the Photo Themes for cars to get a sense of the little details that can elevate car photography (like background or tire placement, for example):
AUTOMOTIVE - Your Car Photography
The other two, as mentioned, feel a bit unbalanced. What caught your attention about this scene? Was it the details on the I-bar? Was it the bridge? The focus on the foreground suggests that you were interested in that, but the composition that leaves so much of the background visible (and not so blurred out that you can't make out details) draws attention away from those foreground details. The bridge looks nice, but the clutter of the parking lot detracts a lot from the bridge.
Keep shooting!
