You're doing what I did when I first joined, and that was to go through the archives and upload landscapes from previous vacations. It's the right thing to do, if you got 'em, upload 'em.
However, generic landscapes don't sell that well. They need to be way above average in order to get sales. It's OK in stock to cheat and edit images if that's what it takes to beat out everyone else for a sale. Being as good as everyone else doesn't cut it. You have to be BETTER.
Getting a sale on your first day may have tainted your expectations. You images are too new to have been in the database for very long.
You need to improve your keyword. For example: WOMEN HIKERS SUMMIT VIEW SAN DIEGO. Look at that image. I see WOMEN. I see hikers. I don't see a summit. I don't see San Diego. I don't see much of a view. Sure, the metropolitan area in the background may be San Diego. It could also be Chicago. I see NOTHING that SPEAKS "San Diego."
I would have titled it WOMEN HIKING, SUMMER FUN. What kind of an image do you think a Buyer will select if he searches on SAN DIEGO? Are we connecting the dots here?
OK, in a few months you will be done uploading your vacation pictures? Then what? Are you going to spend hours in the park trying to photograph squirrels? Sit in the garden all day to capture the different stages of a flower opening up? Those are actually worthy projects for people who are passionate for photography. However this is STOCK. Use your personal time to engage in the type of photography that makes you happy. But when ut's time to shoot STOCK, then SHOOT STOCK.
Your latest images of food is an example of this. You are starting to THINK stock. You'd be amazed how many people cannot change gears and are always chasing the squirrels in the park. There are Contributors who have been known to make the Reviewers gouge out their eyes because they've seen one squirrel picture too many. (Ironically, they become better Reviewers after going blind but that's another subject :-).
You have a female model who is bald. Find the appropriate clothing and you can create CANCER PATIENT images. If she's willing to do that, of course. That's a suggestion for thinking outside the box with limited resources.
If you're passionate for photography, I would also consider taking evening or weekend classes at local institutions. There are online classes too. Classes for photo editing. I was taking classes long before I discovered stock and the experience and knowledge has helped greatly... when I'm not chasing squirrels...
Nikon D800, D100, Canon G15