Aww, don't say that about your own sims! I don't think I could advise someone on how to make their sims since everyone's tastes are so different (I see you're more into a 'cute' style yourself XD), but it might help to read around a bit on how to get out the best of your game via picture taking. Some tuts I found really helpful are these:
- This one on MTS by HP (unfinished but quite helpful)
- About composition by Goodbye_sun (in fact, that entire community has helpful tips on picture taking!)
- Tips to improve composition in real photography
I think picture-taking is the most fun part of TS2 because everything you do - decorating, your sims - just comes together. <3