looks funny as the previous version...
for those 2 shivas, maybe you can make that one are blue and the other green. or even use the sor2 shiva and the sor3 shiva hehe
other curious detail, could be put a police siren over the van. that change is colour from red to blue, you know
and a police shield/sign on the middle of the van. (in the case this vehicle are a police vehicle, if not ignore all this).
this remenbers me a little the robocop arcade game, where enemies get out from one van and attacks yout. there you can see many enemies with fire weapons and even a chainsaw. maybe that coul help for inspiration... after all zan already was edited by you with one of that. so can be used again for other striker that get out inside the van.
like i say on the other forum. a funny sprite for use in one of your police vehicles, for sure will be robocop, from the 2nd arcade part thar have better sprites. it could be cool and hillarious.
have you seen yet those knight rider and delorean bttf incredible mugen chars? they looks amazing. im crazy for try they.
for additional help, you should visit other places like the sprites database or mame retrovicio forum (is spain, but you can talk there on english) they love arcade games, and maybe one of them wants to help you with this hacks cause streets of rage games are legendary. you dont lose nothing for try it...http://www.spriters-resource.com/arcade/tmnt/
(in this one, search any sprites for sor and if the guy includes in their sprite sheet their email adress, try to ask to him if can be interestested in help you)http://www.spriters-resource.com/genesis_32x_scd/sor1/http://www.spriters-resource.com/genesis_32x_scd/sor2/http://www.spriters-resource.com/genesis_32x_scd/sor3/
apart, there you can find curious sprites from other games that maybe could be interesting for you... those of second samurai dont look too bad, right? not belongs to sor, but maybe as rare strikers... http://www.spriters-resource.com/genesis_32x_scd/secondsam/
-this one also could be coolhttp://www.spriters-resource.com/genesis_32x_scd/shinobi3/
-this other could be amazing for striker. and are more close to the sor franchise than any other...http://www.spriters-resource.com/genesis_32x_scd/splatterhouse2/sheet/27007/
-this one also can be cool! LOL. he looks like that one who get out of the van for attack you on robocop arcade.
like this hack is not serius, is hillarious and fun, then maybe you could like to include something out of the sor world for a sorpresive striker. my recomendation in that case are shinobi or robocop, because are the most funny to see. the splatter house 2 char or even a tmnt could be hillarious too... hehe
other places for request some help:
(spanish mame forum of arcade lovers. i can make a post for you in spanish requesting for some help creating sprites if you like it.)
also, dont forget ask for help on the videos of your hacks. just for the case...