When I went digital with my first Pentax, a K-7, back in 2009, it came with the DA18-55 WR. Which made sense at the time, because, although it wasn't a stellar lens optically, it gave me a fair range of photographic options from wideangle to short telephoto, and even made for some degree of weather sealing. It was this lens around which I would build my kit. My kit zoom saw a lot of use at 18mm, whenever I needed a wider angle for travel and family shots, some at 55mm, mostly for casual portraits and details, and little use in between.
Now we happen to be a family of fairly frequent zoo visitors, and so I soon longed for more reach in the telephoto department, without breaking the bank. Reviews of the DA55-200 WR were somewhat mixed and its longest FL a bit short for what I had in mind, and so I ended up getting a DA55-300 as first additional lens. Again, that was not exactly high-end glass, but the real surprise was how it optically wiped the floor with my kit lens, especially with its snappy contrast! (In fact, I'm using that same DA55-300 on my 24MP K-3 to this day, with altogether decent results.)
So much for the zoom. At some point of your photographic journey, and better sooner than later, however, you should also explore what a good prime lens can do for your photography. Pentax has some gorgeously rendering options in its line-up, from the inexpensive plastic-fantastics to the Limiteds and DA*s, and I would suggest the DA50 as a perfect starting point into that world. Yep, like the DA35, its shell and mount are plastic, but the optics are flat out amazing, and that lens can be had for around 100 euros brandnew. (Seriously, if that little gem should break on me one day, I might well just pick up another copy, which tells you something about how much I like its output.)
Otherwise, to foster your growth as a photographer, I would always recommend taking your time to really learn each lens with its capabilities before rushing out and buying another.
Anyway, I would have probably struggled to pull off the attached images, if I hadn't moved beyond the kit zoom, be it for reach, bokeh, flare resistance, or rendering. And, to be sure, that is the chief attraction of an interchangeable-lens camera system. :D
