Since I'm not writing in the Victorian world, things are a bit different, but I find I have trouble putting all the elements together in a good way. I have Steampunk, Southern, and feudalistic Europe, and these are all influencing my setting. I guess you could say its just confusing working out the proper place for things. I tend to wonder what the implications of one small detail would be on twenty other things, and so I get easily sidetracked. Also, I can't find a good intro for what I'm writing. Very frustrating.
Having many influences and enjoying a little bit of everything it's hard to intertwine it all together in a way that it doesn't hurt the story nor take away from the believability you try to create for the reader. There is a point where it can get to be too much and as my art teacher used to say, "sometimes less is more." I guess in a word... "balance.".
As writers we test ourselves... every word, thought, idea and grammatical choice is analyzed and contemplated. We try to produce the best quality material we possibly can and in a genre so open "balance" can sometimes be difficult to find. For me anyway.
Coming from being a script writer... I do have issues sometimes with the descriptive details. I find I'm not putting enough in.
Lately my problem has been where to stop with fantasy elements. That's where a lot of my writing when I was younger was, and now I'm trying to go for a more mature setting.
I also run into problems with scientific details, luckily I've been able to fudge it here and there in the manuscript I'm working on, but I'm always worried that it'll get noticeable. Machinery though, I can figure the basics for, which is really only needed to be hinted at for the setting I have. Pretty sure that the notes I have on the sea craft I gave one character probably wouldn't be able to go as deep as I have it, might have to rework that section...
I think I've pretty much done EVERY prompt in the prompt book I got while writing out ideas for this monster, maybe that's my main problem, way too many ideas, and trying to limit myself to just a few weeks in the character's life (God knows I could go for about a decade of their life.
For me, the challenge with Steampunk is maintaining a high level of "steampunkness" without sacrificing character depth. My stories tend to be character-driven, so I have to be very careful to incorporate the steampunk elements without making them feel like they're just add-ons for the sake of making the story "steampunk." :)