Honestly, as another creative/artist type, I'll say that I'm not sure how much I actually resonate with my own Venus placement. I have Venus in Virgo in the 12th and so much of what I see regarding this placement is about learning about oneself through caring for others, nursing people, being a care taker, etc. Etc. However, I've been drawing since I was a child and have a career pretty much entirely focused on it now. I also have an empty fifth house so that's always been something I haven't resonated with much either.
One big thing I have noticed that can play a role is aspects between the moon (emotions/expressions) and Mars (actions/manifesting). Having an easy aspect between the two shows a need to make your feelings be translated into something more concrete and actively recognizable.
Neptune and Uranus can also play a huge role. Neptune because of dreams, hopes and its ability to sink deeper into things and Uranus because of how it wants to revolutionize the world - and all revolutions need art!
Mercury is also pretty important, especially when it comes to writing (something I also do) as it can be connected to creative problem solving and communication.
The last object I heavily associate with it is Chiron, since if your Chiron is aspecting any or all of these planets, especially with an easy aspect, it shows that the way through healing will involve some pro-active approach to expressing it and manifesting it.
Admittedly, I think all planets play a role when it comes to creativity (except for maybe Saturn and Pluto. Those are two that I still don't see heavily associated with it unless its about discipline and how we might change that form of expression), so I'd say sit down and study the other planets a bit more.
Your mercury is conjunct your sun! That shows that communication is a pretty heavy and big priority for you! Mercury is also on the fifth house cusp which shows word play as an enjoyable activity for you.
Moon is trining your Mars and Jupiter shows a need for emotional expression by allowing it to have room to breath and actually BE!
I've also got an Aqua fifth house and what I've learned is that it can be a 'mechanical' form of creative expression (though it may prove itself to be more fluid since you have planets in yours). By Mechanical I mean that you can likely still create likely rather easily as long as you are not heavily caught up in emotions as you do it. You can (and will!) Still feel deeply but as you create, your feelings might shut off so that you can genuinely focus on creating and producing the best product you can. My friends have been impressed in the past at my ability to work through hard times but that's because I'm (to a degree) able to dissociate my emotions from my creative process, so even if I'm under heavy stress and pressure, I'm still able to because it's over all a cerebral process for me (air ruled 5H) as opposed to a heavily emotional one. You may also feel a need to express as a form of rebellion (Aqua 5H, Uranus in Aqua) too.
Also to note - sometimes the 4th house is also associated with the root of our consciousness/perception/ideas. So it's possible that those planets placed in there are providing creative expression by constantly trying to revolutionize how you see the world and to better understand your roots. Maybe you'll find yourself doing a lot of writing about where you came from, how you grew up, the things you saw and witnessed as a child. There's a lot of ways the 4H can express itself creatively that isn't necessarily associated with taking care of the home!