Oh good - you're providing a mixture of US and Allied markings for these kits.
- the star in yellow circle was very rare, as it only featured on (some) vehicles involved in the invasion of Sicily in 1943. I'd query whether it's worth including it. The US flag was also pretty rare after 1943.
- you only need the bridging plates (black number in yellow circle) for the M5A1 and M8 - which seems to have been "15" and "16" respectively. These plates were pretty rare on tanks, so you could drop them.
- if you're including French markings, you also need French-style registration numbers. Maybe drop these to make more space?
- given that the moulded-on grouser stowage on the turrets makes placement of markings difficult, is it actually worth including the British squadron markings?
- I assume you've decided to omit formation signs and numbers for space reasons, but a couple of British formation/arm of service signs would be nice. The Guards Armoured used the M5A1, for instance.
- many US Army M5A1s in Normandy had their length, weight etc stenciled on the angled armour on the right side.
- maybe include more callsigns (the big numbers in yellow)? These seem to have been pretty common.
- the only name you've included ("Hothead") is a USMC vehicle. Some more vehicle names would be nice. Here are some suggestions:
US Army M5A1 (mid production) names included "Sloppy Joe", "Mickey Georgiana", "Cognac", "Carol" and "Destruction"; USMC names included "Nannie" and "Hunter".
US Army M5A1 (late production) names included "Brig", "Dingbat" and "Dagwood".
British Army M5A1 names included "Halcyon" and "The Black Bear"
M8 names included "Laxative" (it also had a large yellow callsign "3-9").
Recce names (including Recces based M3 and M3A3 hulls) included: "The Curse of Scotland", "Havoc" and "Hornblower".
Hope that helps.