Never knew you but Welcome Back
Alright, Feedback Time.
First problem i noticed is the main menu pics. Personally I wouldnt go for them in that way HOWEVER if you choose to do so then try to have cleaner edges(they look bad no offense.) Now if rendering/fixing them up isnt in your skill set,then i recommend giving both Ryu and Sol a white outline so it wont look so bad(adding onto that,its easier to notice since you're making this for HD resolution).
Next, the BG. I would change it completely. It can actually stay in the select screen but change it in the main menu and options menu.
First off,its just boring to see the same pic over and over. Period.
Second, I have seen this one in particular WAY too many times
(its been in stages,I used it(somewhat,i still have it in my favs on dev art,etc etc)
As i Said,it can stay in the select,but i'd change the bg in the main menu. Now i know this isnt complete so i wont mention the default elecbyte font.
Adding back on to the Ryu and Sol pics,they have colorloss. You should try RGB method maybe on them to remove that loss unless you wanna jigsaw,your choice. It isnt a lot of loss,but its noticeable.
Select screen now:
I assume you left those bars at the top and bottom for a "select your fighter" scroll text or something to that effect,maybe instead of black have a blue-to-red and red-to-blue gradient for that(again RGB would work great here)
This isnt a huge deal since its only slightly noticeable,but your select hexagons are a little.....off.They look like they were rotated very slightly(I saw how some ports fit perfect and some got cut a pixel early,which to me was you trying to have them fit well.)
Overall I like the whole concept behind the select(and the BGM). Behind the select ports on the sides,you left the bg areas black,maybe give them a blue and red bg like the big ports,but more see through(trans = add) so they dont look like the separators.(this would also solve your text problem that i see.)
My white/jagged edges apply on the small ports in this case as well. Funny enough most of your big ports looks great,even edge wise.
I would comment on the lifebars,but i have no better suggestions.
Lastly,i havent bothered to check what is causing it but wtf here at the top(im venturing to guess its portraits?) I'll check later