seems like a lot of sane people on pentaxforums
. your gear is fine, your pictures (technique) decent.
disclaimer: i am _not_ a professional photographer myself.
if you want better, especially commercially, i'd say:
- focus on a specific area (like "baby photography" or "portraits" or such)
- learn to use your gear (you have excellent gear, nothing of what you have is bad, the k10d is an excellent camera, manual focus lenses can be hard to use but not that hard to make them useless, especially in "studio"); learn how to use your lights, play a lot with lighting, that's the most important thing, technique wise
- close your aperture a bit more in the studio, to get some dof, and be freed from the worry of missing focus if the model breathes
(consider even a cheap focusing screen for the k10d, if you don't have one, to help with focusing those manual lenses)
- play with the lights more, (did i mention play with the lights?), maybe add a second yungnuo flash (they are perfect for studio work -- i prefer mine to the dedicated pentax flash -- and cheap, very good choice there); radio triggers as mentioned are nice
- don't worry about the body, k10 is fine as long as it works. if you have the budget, anything current is fine (k500 included). if budget is tight, keep shooting the k10d.
- you have a decent lens lineup, keep using it, learn it's strengths and weaknesses. you will know exactly what you need if you will want another lens, only then, it's time to shop for a new lens.
- if you want to make money, remember it's hard work, extremely competitive, and it has to do a lot more with how you market yourself/how well you do business/how well you make and keep connections ("industry socializing"), than with how good your work is (not that quality of work doesn't matter, it's just it is not enough)
- before you quit your day job, shop around for the kind of "pro" services you want to offer, in your area, see what are the going rates, make an assessment (a very honest one!) of what that would mean if you were to work at those rates (how much cash in, the first two months? does it cover your expenses? how much will you work for that cash? can you really expect that much work coming your way so early on? (recalculate) etc)
there's some pros who have recently been very open about talking about the photo industry, and what it means to make money like that (Zack Arias is one of the popular ones, you will find some of his videos easily; keep in mind though that applies to USA, i have a hunch that's not where you are, so beware)
word of warning: all pro's i've ever talked to or heard speaking about this, will say that "yeah, photography is fun. if you're an amateur"; doing something professionally (for money, against a deadline, with set expectations, needing to deliver, etc), is not the same as "just doing it how and when you feel like it"; watch this carefully:
this one is quite a bit longer, personally i find it insightful:
good luck!