Good idea but I think the antelope blends to much in to the black in the crest, part from that a good design. I would have removed the symbols of the flag and move the antelope up in to the red field in stead, the symbols could come in the space in the bottom where you where in problem with to fill. Jut an idea of my part.

I think its really good, the national symbols are really well incorporated into the crest. The teardrop shape of the crest is excellent and makes it stand out really well from other crests, makes it unique.

Only thing I would change is the country outline at the bottom, you left an enclave off it. A football or this symbol of angola might work better though.

http://4.bp.blogspot.com/_sv_SOl1hq70/S7enTvH0pAI/AAAAAAAABtU/pFHD-Mx9iGo/s1600/pensador03.jpg

the pensador statue would look great there.

@Rabbi I used the flag symbols there because they blended well with the antelope horn and mane. It also worked well for centering the star.

@Spider Thanks for pointing out the missing enclave, terrible on my part. I think adding a football is my #1 option.