Also, am I allowed to request for modifications/redos?
I tried to stick to your base details but unfortunately a lot of the things you wanted are out of my skill range and aren't really worth the time and effort for free work as I would have to make everything for the render myself. Modifications and redos are not allowed as this is a free shop and you have nothing to lose by requesting.
aren't really worth the time and effort for free work
Bynoptic doesn't say "not worth the effort for a free shop" when he opened (and ran) his free GFX shop. I understand about the above skill thing, but if you want to get money by making free GFX, use AdFly. So you can put in more effort knowing you'll get money for this.